Parole in English per '(optics) Preventing visible reflection.'
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adj
- not reflecting light; not glossy
- sounded or spoken in a tone unvarying in pitch
- having lost effervescence
- lacking contrast or shading between tones
- horizontally level
- stretched out and lying at full length along the ground
- having a relatively broad surface in relation to depth or thickness
- lacking taste or flavor or tang
- flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)
- not modified or restricted by reservations
- commercially inactive
- lacking stimulating characteristics; uninteresting
- having a surface without slope, tilt in which no part is higher or lower than another
- (of a musical note) lowered in pitch by one chromatic semitone
- lacking the expected range or depth; not designed to give an illusion or depth
- (not comparable, commerce) Of fees, fares etc., fixed; unvarying.
- Smooth; having no protrusions, indentations or other surface irregularities, or relatively so.
- (golf, of a golf club) Having a head at a very obtuse angle to the shaft.
- At a consistently depressed level; consistently lacklustre.
- (of colours) Without variation in tone or hue (uniform), and dull (not glossy).
- (algebra, ring theory, of a ring homomorphism) Such that its target, regarded as a module over its source, is flat (as above).
- (music, note) Lowered by one semitone.
- In a horizontal line or plane; not sloping.
- (juggling, of a throw) Without spin; spinless.
- (algebraic geometry, scheme theory, of a morphism of schemes) Such that the induced map on every stalk is flat (as a map of rings).
- (authorship, figuratively, especially of a character) Lacking in depth, substance, or believability; underdeveloped; one-dimensional.
- (horticulture, of certain fruits) Flattening at the ends.
- (slang) Having small or invisible breasts and/or buttocks.
- (phonetics, of a vowel) Not diphthongal; without variation in height or backness.
- (of a tire or other inflated object) Deflated, especially because of a puncture.
- (homological algebra, of a module) Such that the tensor product preserves exact sequences. See Flat module on Wikipedia.Wikipedia.
- (of a battery) Unable to emit power; dead.
- (of measurements of time) Exact.
- Without variation in level, quantity, value, tone etc.
- Having no variations in height.
- (music) Of a note or voice, lower in pitch than it should be.
- (music, voice) Without variations in pitch.
- (figurative) Lacking liveliness or action; depressed; uninteresting; dull and boring.
- Absolute; downright; peremptory.
- (grammar) Not having an inflectional ending or sign, such as a noun used as an adjective, or an adjective as an adverb, without the addition of a formative suffix; or an infinitive without the sign "to".
- (wine) Lacking acidity without being sweet.
- (of coffee) Having little froth and little milk.
- (of a carbonated drink) With all or most of its carbon dioxide having come out of solution so that the drink no longer fizzes or contains any bubbles.
noun
- a shallow box in which seedlings are started
- a deflated pneumatic tire
- scenery consisting of a wooden frame covered with painted canvas; part of a stage setting
- a level tract of land
- a musical notation indicating one half step lower than the note named
- a suite of rooms usually on one floor of an apartment house
- freight car without permanent sides or roof
- (American football) The areas behind the line of scrimmage to either side of an offensive football formation.
- (rail transport) A flat spot on the wheel of a rail vehicle.
- (publishing) A flat, glossy children's book with few pages.
- An area of level ground (sometimes covered with shallow or tidal water).
- (technical, theatre, stagecraft) A rectangular wooden structure covered with masonite, lauan, or muslin, often produced in standard modules, that is used to build wall surfaces on stage. Flats can be painted and outfitted with doors and/or windows to depict a building or other part of a scene, and are a hard-surfaced alternative to a backcloth or backdrop.
- (entomology) Any of various hesperiid butterflies that spread their wings open when they land.
- A flat sheet for use on a bed.
- (horse racing, with 'the' or attributively, sometimes with capital) Level horse-racing ground, as contrasted with courses incorporating jumps, or the racing done on such ground.
- (postal) A large mail piece measuring at least 8 1/2 by 11 inches, such as catalogs, magazines, and unfolded paper enclosed in large envelopes.
- (music) A note played one chromatic semitone lower than a natural, denoted by the symbol ♭ placed after the letter representing the note (e.g., B♭) or in front of the note symbol (e.g. ♭♪).
- (in the plural) A type of ladies' shoe with a very low heel.
- (informal, automotive) A flat tyre/flat tire.
- (painting) A thin, broad brush used in oil and watercolour painting.
- (optics) A flat (i.e. plane) mirror
- Ellipsis of flat ride (“spinning amusement ride”).
- A wide, shallow container or pallet.
- (geometry) A subset of n-dimensional space that is congruent to a Euclidean space of lower dimension.
- (in the plural) A type of flat-soled running shoe without spikes.
- The most prominent flat part of something.
- A flat-bottomed boat, without keel, and of small draught.
- (swordfighting) The flat side of a blade, as opposed to the sharp edge.
- A straw hat, broad-brimmed and low-crowned.
- A platform on a wheel, upon which emblematic designs etc. are carried in processions.
- (Australia, horse racing, with 'the' or attributively, sometimes with capital) the area in the centre of a racecourse.
- (gambling, slang) A cheater's die with the edges shaved to make certain rolls more likely.
- (in the phrase 'the flat') Level ground in general.
- (historical) An early kind of toy soldier having a flat design.
- (US) Ellipsis of flat water (“nonfizzy drinking water”).
- (chiefly British, New England, South Africa, India, Australia, New Zealand, Singapore, archaic elsewhere) A complete domicile occupying only part of a building, especially one for rent
- (Canadian Prairies, British Columbia) A 24-case of beer.
- The palm of the hand, with the adjacent part of the fingers.
- (rail transport, US) A railroad car without a roof, and whose body is a platform without sides; a platform car or flatcar.
- (mining) A horizontal vein or ore deposit auxiliary to a main vein; also, any horizontal portion of a vein not elsewhere horizontal.
adv
- with flat sails
- in a forthright manner; candidly or frankly
- Completely, firmly, or unequivocally.
- Directly; flatly.
- (with units of time, distance, etc) Used to emphasize the smallness of the measurement.
- (finance, slang) Without allowance for accrued interest.
- Completely.
- (of accurately measured timings) Exactly, precisely.
- So as to be flat.
- (of a sentence) Without parole.
verb
- (transitive) To dash or throw
- (poker slang) To make a flat call; to call without raising.
- (intransitive) To become flat or flattened; to sink or fall to an even surface.
- (intransitive, music, colloquial) To fall from the pitch.
- (intransitive) To dash, rush
- (transitive, music) To depress in tone, as a musical note; especially, to lower in pitch by half a tone.
adj
noun
- the property of having little or no contrast; lacking highlights or gloss
- a mass that is densely tangled or interwoven
- a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete
- a small pad of material that is used to protect surface from an object placed on it
- a thick flat pad used as a floor covering
- sports equipment consisting of a piece of thick padding on the floor for gymnastic sports
- mounting consisting of a border or background for a picture
- A thickly tangled mess.
- A flat piece of coarse material used for wiping one’s feet, or as a decorative or protective floor covering.
- A thin layer of woven, non-woven, or knitted fiber that serves as reinforcement to a material.
- (athletics) A floor pad to protect athletes.
- Alternative spelling of matte (“decorative border around a picture”).
- A small flat piece of material used to protect a surface from anything hot or rough; a coaster.
- Vulgar, obscene, or profane language in Russian and some other Slavic language communities.
- (printing) Clipping of matrix.
- (coppersmithing) An alloy of copper, tin, iron, etc.; white metal.
- A thin surface layer; superficial cover.
- Alternative form of matte (“instrument for producing a dull, lustreless surface”).
- (video games slang, chiefly in the plural) Clipping of material.
verb
- twist together or entwine into a confusing mass
- change texture so as to become matted and felt-like
- (transitive) To cover, protect or decorate with mats.
- Alternative form of matte (“to produce a dull, lustreless surface on metal”).
- (intransitive) To form a thick, tangled mess; to interweave into, or like, a mat; to entangle.
adj
noun
- the property of having little or no contrast; lacking highlights or gloss
- (film) Alternative spelling of matte (“background, often painted or created with computers”).
- Alternative spelling of mat (“an alloy in coppersmithing”).
- Alternative form of matte (“instrument for producing a dull, lustreless surface”).
verb
adj
noun
- the property of having little or no contrast; lacking highlights or gloss
- a mixture of sulfides that forms when sulfide metal ores are smelted
- (pyrometallurgy) The molten metal sulfide phases typically formed during smelting of copper, nickel, and other base metals.
- (art, photography) A decorative border around a picture used to inset and center the contents of a frame.
- An instrument for producing a dull, lustreless surface.
- (film) A background, often painted or created with computers
verb
noun
- An object that partially or completely impedes the amount of light reaching the eye.
- (medicine, cardiology) A catheter-delivered device that blocks a hole in the wall of a heart, often having an umbrella-type design and folded up until the catheter arrives at the area of the defect in the heart. Once in place the occluder is unfolded on both sides of the defect so that pressure from both sides keeps it in place.
- (medicine) An implement designed to temporarily block light to one eye.
adj
- Containing components such as achromatic lenses and prisms, designed to prevent color-related distortion.
- (optics) Free from color; transmitting light without color-related distortion.
- (biology, of tissue) Uncolored; not absorbing color from a fluid.
- (music) Having only the diatonic notes of the scale; not modified by accidentals.
- having no hue
adj
- reflecting light
- superficially attractive and stylish; suggesting wealth or expense
- based on pretense; deceptively pleasing
- (of paper and fabric and leather) having a surface made smooth and shiny especially by pressing between rollers
- (figurative) Attention-grabbing and superficially attractive.
- Having a smooth, silklike, reflective (shiny) surface.
noun
adj
noun
verb
adj
noun
verb
adj
noun
- (attributive) The blocking out of as much light as possible.
- (slang, criminology, rare) A mass murder committed, usually in an urban area, to eliminate potential witnesses of a previous crime.
- An instance of censorship, especially a temporary one.
- (Internet) An intentional outage of a website or other online service, typically as a form of protest.
- A large-scale power failure, and resulting loss of electricity to consumers.
- (historical) The mandatory blocking of all light emanating from buildings, as well as outdoor and street lighting as a measure against aerial bombing or naval attack, as imposed during, e.g., World War II.
- A temporary loss of consciousness.
- A temporary loss of memory.
- a suspension of radio or tv broadcasting
- a momentary loss of consciousness
- partial or total loss of memory
- the failure of electric power for a general region
- darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)
verb
noun
prefix
adj
- emitting or reflecting very little light
- lacking in liveliness or animation
- not having a sharp edge or point
- slow to learn or understand; lacking intellectual acuity
- darkened with overcast
- blunted in responsiveness or sensibility
- so lacking in interest as to cause mental weariness
- not clear and resonant; sounding as if striking with or against something relatively soft
- not keenly felt
- (of business) not active or brisk
- (of color) very low in saturation; highly diluted
- being or made softer or less loud or clear
- Not clear, muffled. (of a noise or sound)
- Bored, depressed, down.
- Insensible; unfeeling.
- Sluggish, listless.
- Cloudy, overcast.
- (of pain etc) Not intense; felt indistinctly or only slightly.
- Not bright or intelligent; stupid; having slow understanding.
- Heavy; lifeless; inert.
- Not shiny; having a matte finish or no particular luster or brightness.
- Boring; not exciting or interesting.
- Lacking the ability to cut easily; not sharp.
verb
- make less lively or vigorous
- make dull in appearance
- become less interesting or attractive
- become dull or lusterless in appearance; lose shine or brightness
- make dull or blunt
- make numb or insensitive
- deaden (a sound or noise), especially by wrapping
- (intransitive) To lose a sharp edge; to become dull.
- To render dim or obscure; to sully; to tarnish.
- (transitive) To render dull; to remove or blunt an edge or something that was sharp.
- (transitive) To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy.
adj
- Allowing little light to pass through, not translucent or transparent.
- (computing) Describes a type for which higher-level callers have no knowledge of data values or their representations; all operations are carried out by the type's defined abstract operators.
- Neither reflecting nor emitting light.
- (figuratively) Obtuse, stupid.
- (figuratively) Unclear, unintelligible, hard to get or explain the meaning of.
- hard or impossible to understand
- not transmitting or reflecting light or radiant energy; impenetrable to sight
noun
verb
verb
- protect from light, heat, or view
- represent the effect of shade or shadow on
- vary slightly
- pass from one quality such as color to another by a slight degree
- cast a shadow over
- (transitive, slang) To throw shade, to subtly insult someone.
- (transitive) To darken, particularly in drawing.
- (intransitive, rare) To shield oneself from light.
- (intransitive, baseball, of a defensive player) To move slightly from one's normal fielding position.
- To win by a narrow margin.
- (intransitive) To vary or approach something slightly, particularly in color.
- (transitive, graphical user interface) To reduce (a window) so that only its title bar is visible.
- (transitive) To shield (someone or something) from light.
- (transitive) To alter slightly.
noun
- relative darkness caused by light rays being intercepted by an opaque body
- protective covering that protects something from direct sunlight
- a subtle difference in meaning or opinion or attitude
- a representation of the effect of shadows in a picture or drawing (as by shading or darker pigment)
- a mental representation of some haunting experience
- a position of relative inferiority
- a protective ornamental covering for a lamp, used to screen a light bulb from direct view
- a slight amount or degree of difference
- a quality of a given color that differs slightly from another color
- (figuratively, in the plural) An aspect that is reminiscent of something.
- (countable) A postage stamp showing an obvious difference in colour/color to the original printing and needing a separate catalogue/catalog entry.
- (uncountable) Darkness where light, particularly sunlight, is blocked.
- (historical) A candle-shade.
- (countable) A cover around or above a light bulb, a lampshade.
- A very small degree of a quantity, or variety of meaning
- (figuratively) A subtle variation in a concept.
- (countable) Something that blocks light, particularly in a window.
- (chiefly literary and fantasy) A ghost or specter; a spirit.
- (countable) A variety of a color, in particular one obtained by adding black (compare tint).
- (uncountable, originally LGBTQ slang) Subtle insults.
noun
- an unwanted reflection in an optical system (or the fogging of an image that is caused by such a reflection)
- a device that produces a bright light for warning or illumination or identification
- reddening of the skin spreading outward from a focus of infection or irritation
- a sudden outburst of emotion
- a sudden burst of flame
- a shape that spreads outward
- (baseball) a fly ball hit a short distance into the outfield
- a short forward pass to a back who is running toward the sidelines
- a burst of light used to communicate or illuminate
- a sudden eruption of intense high-energy radiation from the sun's surface; associated with sunspots and radio interference
- a sudden recurrence or worsening of symptoms
- (figuratively) A sudden eruption or outbreak; a flare-up.
- A type of pyrotechnic that produces a brilliant light without an explosion, used to attract attention in an emergency, to illuminate an area, or as a decoy.
- A widening of an object with an otherwise roughly constant width.
- (in the plural) Bell-bottom trousers.
- (aviation) The transition from downward flight to level flight just before landing.
- (oil industry) A flame produced by a burn-off of waste gas (flare gas) from a flare tower (or flare stack), typically at an oil refinery.
- A source of brightly burning light or intense heat.
- (baseball) A low fly ball that is hit in the region between the infielders and the outfielders.
- A sudden bright light.
- (nautical) The increase in width of most ship hulls with increasing height above the waterline.
- (photography) Ellipsis of lens flare.
- An inflammation such as of tendons (tendonitis) or joints (osteoarthritis).
- (American football) A route run by the running back, releasing toward the sideline and then slightly arcing upfield looking for a short pass.
- A breakdance move of someone helicoptering his torso on alternating arms.
verb
- become flared and widen, usually at one end
- burn brightly
- shine with a sudden light
- erupt or intensify suddenly
- (intransitive, figuratively) To suddenly happen or intensify.
- (transitive) To cause inflammation; to inflame.
- (intransitive) To shine out with a sudden and unsteady light; to emit a dazzling or painfully bright light.
- (ambitransitive, aviation) To (operate an aircraft to) transition from downward flight to level flight just before landing.
- (intransitive, figuratively) To suddenly erupt in anger.
- (transitive) To cause to burn; in particular, to burn off excess gas.
- (ambitransitive) To open outward in shape.
- (intransitive, figuratively) To shine out with gaudy colours; to be offensively bright or showy.
- (intransitive) To blaze brightly.
noun
- (optics) The angle of incidence beyond which light traveling through a medium experiences total internal reflection upon encountering a boundary with a less refractive medium.
- (aviation) The angle of attack beyond which an airfoil stalls, experiencing a decrease in lift and increase in drag due to separation of airflow from the upper surface of the airfoil.
- (architecture) The angle beyond which a ramp or a set of stairs is considered uncomfortable or unsafe.
- the smallest angle of incidence for which light is totally reflected
noun
- darkening or obscuring the sight of something
- the activity of obscuring people's understanding, leaving them baffled or bewildered
- confusion resulting from failure to understand
- (uncountable) The act or process of obfuscating, or obscuring the perception of something; the concept of concealing the meaning of a communication by making it more confusing and harder to interpret.
- (computing, uncountable) The alteration of computer code to preserve its behavior while concealing its structure and intent.
- (countable) A single instance of intentionally obscuring the meaning of something to make it more difficult to grasp.
- (uncountable) Confusion, bewilderment, or a baffled state resulting from something obfuscated, or made more opaque and muddled with the intent to obscure information.
noun
- (optics) A single-faceted reflector.
- (geometry) A one-dimensional object comprising one vertex and one (not necessarily straight) edge both of whose ends are that vertex.
- (geometry) A two-dimensional object comprising one vertex, one edge both of whose ends are that vertex, and one face filling in the hollow formed by that edge.
noun
verb
noun
- the quality of shining with a bright reflected light
- a rapid change in brightness; a brief spark or flash
- (physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particle
- a brilliant display of wit
- the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight
- (nuclear physics) The flash of light produced by something (especially a phosphor) when it absorbs ionizing radiation.
- (figurative) A brief expression that is amusing or clever; witticism.
- (astronomy) The twinkling of a star or other celestial body caused by turbulence in the Earth's atmosphere.
- A flash of light; a spark.
noun
verb
- become bubbly or frothy or foaming
- reflect brightly
- emit or produce sparks
- be lively or brilliant or exhibit virtuosity
- (transitive) To emit in the form or likeness of sparks.
- (intransitive) To emit sparks; to throw off ignited or incandescent particles
- (by extension) To shine as if throwing off sparks; to emit flashes of light; to scintillate; to twinkle
- (intransitive) To emit little bubbles, as certain kinds of liquors; to effervesce
- (intransitive) To manifest itself by, or as if by, emitting sparks; to glisten; to flash.
noun
- optical properties
- the branch of physics that studies the physical properties of light
- (physics) The physics of light and vision: basic optical science.
- Technology that makes use of such physics: applied optical science; business lines making use of such technology.
- The light-related aspects of a device.
- (figuratively) Perception, image, public relations, especially in politics.
- plural of optic
noun
- an appearance of reflected light
- a flash of light (especially reflected light)
- A look of joy or liveliness on one's face.
- A bright, but intermittent or short-lived, appearance of something.
- (countable) An appearance of light, especially one which is indistinct or small, or short-lived.
- An indistinct sign of something; a glimpse or hint.
verb
- to shine with faint or brief light
- shine brightly, like a star or a light
- be shiny, as if wet
- To shine, especially in an indistinct or intermittent manner; to glisten, to glitter.
- (transitive) Chiefly in conjunction with an adverb: to cause (light) to shine.
- (figuratively) To be strongly but briefly apparent.
noun
- an appearance of reflected light
- light from nonthermal sources
- a steady even light without flames
- the phenomenon of light emission by a body as its temperature is raised
- the amount of electromagnetic radiation leaving or arriving at a point on a surface
- a feeling of considerable warmth
- an alert and refreshed state
- A state of heat being emitted by a person or an animal's body.
- A state of brightness or warmth of colour; specifically, a reddish colour on a person's face indicating health or youth; a flush.
- A state of light being emitted by something (for example, a bioluminescent animal or fungus, or a mineral) which is not hot; luminescence.
- A state of heat and light being emitted by a hot object.
- A condition of being passionate or having warm feelings; an ardour.
verb
- shine intensely, as if with heat
- emit a steady even light without flames
- be exuberant or high-spirited
- have a complexion with a strong bright color, such as red or pink
- experience a feeling of well-being or happiness, as from good health or an intense emotion
- To be very hot; also, to be on fire; to burn.
- (figurative, Internet slang, alt-right) To expose (someone) to the authorities.
- To emit heat and light without a flame.
- Of a person: to display intense emotion.
- Of a fire: to emit heat and light.
- To emit light brightly and steadily as if heated to a high temperature; to shine.
- (intransitive, obsolete except UK, dialectal) To look intently; to stare.
- Of a person's body or a part of it: to feel hot and often to flush (“become suffused with a reddish colour”) as well, due to an emotional response, exertion, etc.
- (chiefly US, Internet slang) To be involved in an (chiefly online) undercover sting operation, especially by American federal agencies.
- Of a colour: to be bright; also, of a thing: to have a bright colour.
- (chiefly US, Internet slang, alt-right) To create a threatening online post that may involve violence, and look suspicious enough to attract a police investigation.
adj
- (not comparable, optics) Having the capacity to separate spectral colours by refraction.
- (biology) Relating to chromatin (a complex of DNA, RNA, and proteins within the cell nucleus out of which chromosomes condense during cell division).
- (Ancient Greece, historical) One of three types of tetrachord (the others being the diatonic and enharmonic), with an interval between half and four-fifths of the total interval of a tetrachord.
- (comparable) Brightly coloured; colourful, vivid.
- Relating to or using notes not belonging to the diatonic scale of the key in which a passage of music is written.
- (not comparable) Characterized or caused by, or relating to, colour or hue.
- (not comparable, graph theory) Relating to colorings of graphs.
- based on a scale consisting of 12 semitones
- being or having or characterized by hue
- able to refract light without spectral color separation
noun
- lens used to concentrate light on an object
- an apparatus that converts vapor into liquid
- an electrical device characterized by its capacity to store an electric charge
- a hollow coil that condenses by abstracting heat
- (process engineering) A device designed to condense a gas into a liquid, either as part of a still, steam engine, refrigerator or similar machine.
- (electronics, chiefly historical or in compound terms) A capacitor.
- (optics) A lens (or combination of lenses) designed to gather light and focus it onto a specimen or part of a mechanism.
- A dental instrument used to pack filling into a cavity in a tooth.
noun
- optical glass of low dispersion and low refractive index
- a glass blown into a globe which is later flattened and spun to form a disk
- (optics) A variety of glass used in lenses and other optical components due to its low refractive index and dispersion. Originally crown glass was made from alkali-lime silicates with approximately 10% potassium oxide, but similar properties may be attained with other recipes.
- An early type of window glass made by blowing glass into a hollow globe (crown) and then flattening it on a punty, reheating and spinning out into a flat disk by centrifugal force.
noun
- An object that partially or completely impedes the amount of light reaching the eye.
- (medicine, cardiology) A catheter-delivered device that blocks a hole in the wall of a heart, often having an umbrella-type design and folded up until the catheter arrives at the area of the defect in the heart. Once in place the occluder is unfolded on both sides of the defect so that pressure from both sides keeps it in place.
- (medicine) An implement designed to temporarily block light to one eye.
noun
- (attributive) The blocking out of as much light as possible.
- (slang, criminology, rare) A mass murder committed, usually in an urban area, to eliminate potential witnesses of a previous crime.
- An instance of censorship, especially a temporary one.
- (Internet) An intentional outage of a website or other online service, typically as a form of protest.
- A large-scale power failure, and resulting loss of electricity to consumers.
- (historical) The mandatory blocking of all light emanating from buildings, as well as outdoor and street lighting as a measure against aerial bombing or naval attack, as imposed during, e.g., World War II.
- A temporary loss of consciousness.
- A temporary loss of memory.
- a suspension of radio or tv broadcasting
- a momentary loss of consciousness
- partial or total loss of memory
- the failure of electric power for a general region
- darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)
verb
noun
noun
- an unwanted reflection in an optical system (or the fogging of an image that is caused by such a reflection)
- a device that produces a bright light for warning or illumination or identification
- reddening of the skin spreading outward from a focus of infection or irritation
- a sudden outburst of emotion
- a sudden burst of flame
- a shape that spreads outward
- (baseball) a fly ball hit a short distance into the outfield
- a short forward pass to a back who is running toward the sidelines
- a burst of light used to communicate or illuminate
- a sudden eruption of intense high-energy radiation from the sun's surface; associated with sunspots and radio interference
- a sudden recurrence or worsening of symptoms
- (figuratively) A sudden eruption or outbreak; a flare-up.
- A type of pyrotechnic that produces a brilliant light without an explosion, used to attract attention in an emergency, to illuminate an area, or as a decoy.
- A widening of an object with an otherwise roughly constant width.
- (in the plural) Bell-bottom trousers.
- (aviation) The transition from downward flight to level flight just before landing.
- (oil industry) A flame produced by a burn-off of waste gas (flare gas) from a flare tower (or flare stack), typically at an oil refinery.
- A source of brightly burning light or intense heat.
- (baseball) A low fly ball that is hit in the region between the infielders and the outfielders.
- A sudden bright light.
- (nautical) The increase in width of most ship hulls with increasing height above the waterline.
- (photography) Ellipsis of lens flare.
- An inflammation such as of tendons (tendonitis) or joints (osteoarthritis).
- (American football) A route run by the running back, releasing toward the sideline and then slightly arcing upfield looking for a short pass.
- A breakdance move of someone helicoptering his torso on alternating arms.
verb
- become flared and widen, usually at one end
- burn brightly
- shine with a sudden light
- erupt or intensify suddenly
- (intransitive, figuratively) To suddenly happen or intensify.
- (transitive) To cause inflammation; to inflame.
- (intransitive) To shine out with a sudden and unsteady light; to emit a dazzling or painfully bright light.
- (ambitransitive, aviation) To (operate an aircraft to) transition from downward flight to level flight just before landing.
- (intransitive, figuratively) To suddenly erupt in anger.
- (transitive) To cause to burn; in particular, to burn off excess gas.
- (ambitransitive) To open outward in shape.
- (intransitive, figuratively) To shine out with gaudy colours; to be offensively bright or showy.
- (intransitive) To blaze brightly.
noun
- (optics) The angle of incidence beyond which light traveling through a medium experiences total internal reflection upon encountering a boundary with a less refractive medium.
- (aviation) The angle of attack beyond which an airfoil stalls, experiencing a decrease in lift and increase in drag due to separation of airflow from the upper surface of the airfoil.
- (architecture) The angle beyond which a ramp or a set of stairs is considered uncomfortable or unsafe.
- the smallest angle of incidence for which light is totally reflected
noun
- darkening or obscuring the sight of something
- the activity of obscuring people's understanding, leaving them baffled or bewildered
- confusion resulting from failure to understand
- (uncountable) The act or process of obfuscating, or obscuring the perception of something; the concept of concealing the meaning of a communication by making it more confusing and harder to interpret.
- (computing, uncountable) The alteration of computer code to preserve its behavior while concealing its structure and intent.
- (countable) A single instance of intentionally obscuring the meaning of something to make it more difficult to grasp.
- (uncountable) Confusion, bewilderment, or a baffled state resulting from something obfuscated, or made more opaque and muddled with the intent to obscure information.
noun
- (optics) A single-faceted reflector.
- (geometry) A one-dimensional object comprising one vertex and one (not necessarily straight) edge both of whose ends are that vertex.
- (geometry) A two-dimensional object comprising one vertex, one edge both of whose ends are that vertex, and one face filling in the hollow formed by that edge.
noun
verb
noun
- the quality of shining with a bright reflected light
- a rapid change in brightness; a brief spark or flash
- (physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particle
- a brilliant display of wit
- the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight
- (nuclear physics) The flash of light produced by something (especially a phosphor) when it absorbs ionizing radiation.
- (figurative) A brief expression that is amusing or clever; witticism.
- (astronomy) The twinkling of a star or other celestial body caused by turbulence in the Earth's atmosphere.
- A flash of light; a spark.
noun
verb
- become bubbly or frothy or foaming
- reflect brightly
- emit or produce sparks
- be lively or brilliant or exhibit virtuosity
- (transitive) To emit in the form or likeness of sparks.
- (intransitive) To emit sparks; to throw off ignited or incandescent particles
- (by extension) To shine as if throwing off sparks; to emit flashes of light; to scintillate; to twinkle
- (intransitive) To emit little bubbles, as certain kinds of liquors; to effervesce
- (intransitive) To manifest itself by, or as if by, emitting sparks; to glisten; to flash.
noun
- optical properties
- the branch of physics that studies the physical properties of light
- (physics) The physics of light and vision: basic optical science.
- Technology that makes use of such physics: applied optical science; business lines making use of such technology.
- The light-related aspects of a device.
- (figuratively) Perception, image, public relations, especially in politics.
- plural of optic
noun
- an appearance of reflected light
- a flash of light (especially reflected light)
- A look of joy or liveliness on one's face.
- A bright, but intermittent or short-lived, appearance of something.
- (countable) An appearance of light, especially one which is indistinct or small, or short-lived.
- An indistinct sign of something; a glimpse or hint.
verb
- to shine with faint or brief light
- shine brightly, like a star or a light
- be shiny, as if wet
- To shine, especially in an indistinct or intermittent manner; to glisten, to glitter.
- (transitive) Chiefly in conjunction with an adverb: to cause (light) to shine.
- (figuratively) To be strongly but briefly apparent.
noun
- an appearance of reflected light
- light from nonthermal sources
- a steady even light without flames
- the phenomenon of light emission by a body as its temperature is raised
- the amount of electromagnetic radiation leaving or arriving at a point on a surface
- a feeling of considerable warmth
- an alert and refreshed state
- A state of heat being emitted by a person or an animal's body.
- A state of brightness or warmth of colour; specifically, a reddish colour on a person's face indicating health or youth; a flush.
- A state of light being emitted by something (for example, a bioluminescent animal or fungus, or a mineral) which is not hot; luminescence.
- A state of heat and light being emitted by a hot object.
- A condition of being passionate or having warm feelings; an ardour.
verb
- shine intensely, as if with heat
- emit a steady even light without flames
- be exuberant or high-spirited
- have a complexion with a strong bright color, such as red or pink
- experience a feeling of well-being or happiness, as from good health or an intense emotion
- To be very hot; also, to be on fire; to burn.
- (figurative, Internet slang, alt-right) To expose (someone) to the authorities.
- To emit heat and light without a flame.
- Of a person: to display intense emotion.
- Of a fire: to emit heat and light.
- To emit light brightly and steadily as if heated to a high temperature; to shine.
- (intransitive, obsolete except UK, dialectal) To look intently; to stare.
- Of a person's body or a part of it: to feel hot and often to flush (“become suffused with a reddish colour”) as well, due to an emotional response, exertion, etc.
- (chiefly US, Internet slang) To be involved in an (chiefly online) undercover sting operation, especially by American federal agencies.
- Of a colour: to be bright; also, of a thing: to have a bright colour.
- (chiefly US, Internet slang, alt-right) To create a threatening online post that may involve violence, and look suspicious enough to attract a police investigation.
noun
- lens used to concentrate light on an object
- an apparatus that converts vapor into liquid
- an electrical device characterized by its capacity to store an electric charge
- a hollow coil that condenses by abstracting heat
- (process engineering) A device designed to condense a gas into a liquid, either as part of a still, steam engine, refrigerator or similar machine.
- (electronics, chiefly historical or in compound terms) A capacitor.
- (optics) A lens (or combination of lenses) designed to gather light and focus it onto a specimen or part of a mechanism.
- A dental instrument used to pack filling into a cavity in a tooth.
noun
- optical glass of low dispersion and low refractive index
- a glass blown into a globe which is later flattened and spun to form a disk
- (optics) A variety of glass used in lenses and other optical components due to its low refractive index and dispersion. Originally crown glass was made from alkali-lime silicates with approximately 10% potassium oxide, but similar properties may be attained with other recipes.
- An early type of window glass made by blowing glass into a hollow globe (crown) and then flattening it on a punty, reheating and spinning out into a flat disk by centrifugal force.
verb
- protect from light, heat, or view
- represent the effect of shade or shadow on
- vary slightly
- pass from one quality such as color to another by a slight degree
- cast a shadow over
- (transitive, slang) To throw shade, to subtly insult someone.
- (transitive) To darken, particularly in drawing.
- (intransitive, rare) To shield oneself from light.
- (intransitive, baseball, of a defensive player) To move slightly from one's normal fielding position.
- To win by a narrow margin.
- (intransitive) To vary or approach something slightly, particularly in color.
- (transitive, graphical user interface) To reduce (a window) so that only its title bar is visible.
- (transitive) To shield (someone or something) from light.
- (transitive) To alter slightly.
noun
- relative darkness caused by light rays being intercepted by an opaque body
- protective covering that protects something from direct sunlight
- a subtle difference in meaning or opinion or attitude
- a representation of the effect of shadows in a picture or drawing (as by shading or darker pigment)
- a mental representation of some haunting experience
- a position of relative inferiority
- a protective ornamental covering for a lamp, used to screen a light bulb from direct view
- a slight amount or degree of difference
- a quality of a given color that differs slightly from another color
- (figuratively, in the plural) An aspect that is reminiscent of something.
- (countable) A postage stamp showing an obvious difference in colour/color to the original printing and needing a separate catalogue/catalog entry.
- (uncountable) Darkness where light, particularly sunlight, is blocked.
- (historical) A candle-shade.
- (countable) A cover around or above a light bulb, a lampshade.
- A very small degree of a quantity, or variety of meaning
- (figuratively) A subtle variation in a concept.
- (countable) Something that blocks light, particularly in a window.
- (chiefly literary and fantasy) A ghost or specter; a spirit.
- (countable) A variety of a color, in particular one obtained by adding black (compare tint).
- (uncountable, originally LGBTQ slang) Subtle insults.
adj
- not reflecting light; not glossy
- sounded or spoken in a tone unvarying in pitch
- having lost effervescence
- lacking contrast or shading between tones
- horizontally level
- stretched out and lying at full length along the ground
- having a relatively broad surface in relation to depth or thickness
- lacking taste or flavor or tang
- flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)
- not modified or restricted by reservations
- commercially inactive
- lacking stimulating characteristics; uninteresting
- having a surface without slope, tilt in which no part is higher or lower than another
- (of a musical note) lowered in pitch by one chromatic semitone
- lacking the expected range or depth; not designed to give an illusion or depth
- (not comparable, commerce) Of fees, fares etc., fixed; unvarying.
- Smooth; having no protrusions, indentations or other surface irregularities, or relatively so.
- (golf, of a golf club) Having a head at a very obtuse angle to the shaft.
- At a consistently depressed level; consistently lacklustre.
- (of colours) Without variation in tone or hue (uniform), and dull (not glossy).
- (algebra, ring theory, of a ring homomorphism) Such that its target, regarded as a module over its source, is flat (as above).
- (music, note) Lowered by one semitone.
- In a horizontal line or plane; not sloping.
- (juggling, of a throw) Without spin; spinless.
- (algebraic geometry, scheme theory, of a morphism of schemes) Such that the induced map on every stalk is flat (as a map of rings).
- (authorship, figuratively, especially of a character) Lacking in depth, substance, or believability; underdeveloped; one-dimensional.
- (horticulture, of certain fruits) Flattening at the ends.
- (slang) Having small or invisible breasts and/or buttocks.
- (phonetics, of a vowel) Not diphthongal; without variation in height or backness.
- (of a tire or other inflated object) Deflated, especially because of a puncture.
- (homological algebra, of a module) Such that the tensor product preserves exact sequences. See Flat module on Wikipedia.Wikipedia.
- (of a battery) Unable to emit power; dead.
- (of measurements of time) Exact.
- Without variation in level, quantity, value, tone etc.
- Having no variations in height.
- (music) Of a note or voice, lower in pitch than it should be.
- (music, voice) Without variations in pitch.
- (figurative) Lacking liveliness or action; depressed; uninteresting; dull and boring.
- Absolute; downright; peremptory.
- (grammar) Not having an inflectional ending or sign, such as a noun used as an adjective, or an adjective as an adverb, without the addition of a formative suffix; or an infinitive without the sign "to".
- (wine) Lacking acidity without being sweet.
- (of coffee) Having little froth and little milk.
- (of a carbonated drink) With all or most of its carbon dioxide having come out of solution so that the drink no longer fizzes or contains any bubbles.
noun
- a shallow box in which seedlings are started
- a deflated pneumatic tire
- scenery consisting of a wooden frame covered with painted canvas; part of a stage setting
- a level tract of land
- a musical notation indicating one half step lower than the note named
- a suite of rooms usually on one floor of an apartment house
- freight car without permanent sides or roof
- (American football) The areas behind the line of scrimmage to either side of an offensive football formation.
- (rail transport) A flat spot on the wheel of a rail vehicle.
- (publishing) A flat, glossy children's book with few pages.
- An area of level ground (sometimes covered with shallow or tidal water).
- (technical, theatre, stagecraft) A rectangular wooden structure covered with masonite, lauan, or muslin, often produced in standard modules, that is used to build wall surfaces on stage. Flats can be painted and outfitted with doors and/or windows to depict a building or other part of a scene, and are a hard-surfaced alternative to a backcloth or backdrop.
- (entomology) Any of various hesperiid butterflies that spread their wings open when they land.
- A flat sheet for use on a bed.
- (horse racing, with 'the' or attributively, sometimes with capital) Level horse-racing ground, as contrasted with courses incorporating jumps, or the racing done on such ground.
- (postal) A large mail piece measuring at least 8 1/2 by 11 inches, such as catalogs, magazines, and unfolded paper enclosed in large envelopes.
- (music) A note played one chromatic semitone lower than a natural, denoted by the symbol ♭ placed after the letter representing the note (e.g., B♭) or in front of the note symbol (e.g. ♭♪).
- (in the plural) A type of ladies' shoe with a very low heel.
- (informal, automotive) A flat tyre/flat tire.
- (painting) A thin, broad brush used in oil and watercolour painting.
- (optics) A flat (i.e. plane) mirror
- Ellipsis of flat ride (“spinning amusement ride”).
- A wide, shallow container or pallet.
- (geometry) A subset of n-dimensional space that is congruent to a Euclidean space of lower dimension.
- (in the plural) A type of flat-soled running shoe without spikes.
- The most prominent flat part of something.
- A flat-bottomed boat, without keel, and of small draught.
- (swordfighting) The flat side of a blade, as opposed to the sharp edge.
- A straw hat, broad-brimmed and low-crowned.
- A platform on a wheel, upon which emblematic designs etc. are carried in processions.
- (Australia, horse racing, with 'the' or attributively, sometimes with capital) the area in the centre of a racecourse.
- (gambling, slang) A cheater's die with the edges shaved to make certain rolls more likely.
- (in the phrase 'the flat') Level ground in general.
- (historical) An early kind of toy soldier having a flat design.
- (US) Ellipsis of flat water (“nonfizzy drinking water”).
- (chiefly British, New England, South Africa, India, Australia, New Zealand, Singapore, archaic elsewhere) A complete domicile occupying only part of a building, especially one for rent
- (Canadian Prairies, British Columbia) A 24-case of beer.
- The palm of the hand, with the adjacent part of the fingers.
- (rail transport, US) A railroad car without a roof, and whose body is a platform without sides; a platform car or flatcar.
- (mining) A horizontal vein or ore deposit auxiliary to a main vein; also, any horizontal portion of a vein not elsewhere horizontal.
adv
- with flat sails
- in a forthright manner; candidly or frankly
- Completely, firmly, or unequivocally.
- Directly; flatly.
- (with units of time, distance, etc) Used to emphasize the smallness of the measurement.
- (finance, slang) Without allowance for accrued interest.
- Completely.
- (of accurately measured timings) Exactly, precisely.
- So as to be flat.
- (of a sentence) Without parole.
verb
- (transitive) To dash or throw
- (poker slang) To make a flat call; to call without raising.
- (intransitive) To become flat or flattened; to sink or fall to an even surface.
- (intransitive, music, colloquial) To fall from the pitch.
- (intransitive) To dash, rush
- (transitive, music) To depress in tone, as a musical note; especially, to lower in pitch by half a tone.
adj
noun
- the property of having little or no contrast; lacking highlights or gloss
- a mass that is densely tangled or interwoven
- a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete
- a small pad of material that is used to protect surface from an object placed on it
- a thick flat pad used as a floor covering
- sports equipment consisting of a piece of thick padding on the floor for gymnastic sports
- mounting consisting of a border or background for a picture
- A thickly tangled mess.
- A flat piece of coarse material used for wiping one’s feet, or as a decorative or protective floor covering.
- A thin layer of woven, non-woven, or knitted fiber that serves as reinforcement to a material.
- (athletics) A floor pad to protect athletes.
- Alternative spelling of matte (“decorative border around a picture”).
- A small flat piece of material used to protect a surface from anything hot or rough; a coaster.
- Vulgar, obscene, or profane language in Russian and some other Slavic language communities.
- (printing) Clipping of matrix.
- (coppersmithing) An alloy of copper, tin, iron, etc.; white metal.
- A thin surface layer; superficial cover.
- Alternative form of matte (“instrument for producing a dull, lustreless surface”).
- (video games slang, chiefly in the plural) Clipping of material.
verb
- twist together or entwine into a confusing mass
- change texture so as to become matted and felt-like
- (transitive) To cover, protect or decorate with mats.
- Alternative form of matte (“to produce a dull, lustreless surface on metal”).
- (intransitive) To form a thick, tangled mess; to interweave into, or like, a mat; to entangle.
adj
noun
- the property of having little or no contrast; lacking highlights or gloss
- (film) Alternative spelling of matte (“background, often painted or created with computers”).
- Alternative spelling of mat (“an alloy in coppersmithing”).
- Alternative form of matte (“instrument for producing a dull, lustreless surface”).
verb
adj
noun
- the property of having little or no contrast; lacking highlights or gloss
- a mixture of sulfides that forms when sulfide metal ores are smelted
- (pyrometallurgy) The molten metal sulfide phases typically formed during smelting of copper, nickel, and other base metals.
- (art, photography) A decorative border around a picture used to inset and center the contents of a frame.
- An instrument for producing a dull, lustreless surface.
- (film) A background, often painted or created with computers
verb
adj
- Containing components such as achromatic lenses and prisms, designed to prevent color-related distortion.
- (optics) Free from color; transmitting light without color-related distortion.
- (biology, of tissue) Uncolored; not absorbing color from a fluid.
- (music) Having only the diatonic notes of the scale; not modified by accidentals.
- having no hue
adj
- reflecting light
- superficially attractive and stylish; suggesting wealth or expense
- based on pretense; deceptively pleasing
- (of paper and fabric and leather) having a surface made smooth and shiny especially by pressing between rollers
- (figurative) Attention-grabbing and superficially attractive.
- Having a smooth, silklike, reflective (shiny) surface.
noun
adj
noun
verb
adj
noun
verb
adj
adj
- emitting or reflecting very little light
- lacking in liveliness or animation
- not having a sharp edge or point
- slow to learn or understand; lacking intellectual acuity
- darkened with overcast
- blunted in responsiveness or sensibility
- so lacking in interest as to cause mental weariness
- not clear and resonant; sounding as if striking with or against something relatively soft
- not keenly felt
- (of business) not active or brisk
- (of color) very low in saturation; highly diluted
- being or made softer or less loud or clear
- Not clear, muffled. (of a noise or sound)
- Bored, depressed, down.
- Insensible; unfeeling.
- Sluggish, listless.
- Cloudy, overcast.
- (of pain etc) Not intense; felt indistinctly or only slightly.
- Not bright or intelligent; stupid; having slow understanding.
- Heavy; lifeless; inert.
- Not shiny; having a matte finish or no particular luster or brightness.
- Boring; not exciting or interesting.
- Lacking the ability to cut easily; not sharp.
verb
- make less lively or vigorous
- make dull in appearance
- become less interesting or attractive
- become dull or lusterless in appearance; lose shine or brightness
- make dull or blunt
- make numb or insensitive
- deaden (a sound or noise), especially by wrapping
- (intransitive) To lose a sharp edge; to become dull.
- To render dim or obscure; to sully; to tarnish.
- (transitive) To render dull; to remove or blunt an edge or something that was sharp.
- (transitive) To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy.
adj
- Allowing little light to pass through, not translucent or transparent.
- (computing) Describes a type for which higher-level callers have no knowledge of data values or their representations; all operations are carried out by the type's defined abstract operators.
- Neither reflecting nor emitting light.
- (figuratively) Obtuse, stupid.
- (figuratively) Unclear, unintelligible, hard to get or explain the meaning of.
- hard or impossible to understand
- not transmitting or reflecting light or radiant energy; impenetrable to sight
noun
verb
adj
- (not comparable, optics) Having the capacity to separate spectral colours by refraction.
- (biology) Relating to chromatin (a complex of DNA, RNA, and proteins within the cell nucleus out of which chromosomes condense during cell division).
- (Ancient Greece, historical) One of three types of tetrachord (the others being the diatonic and enharmonic), with an interval between half and four-fifths of the total interval of a tetrachord.
- (comparable) Brightly coloured; colourful, vivid.
- Relating to or using notes not belonging to the diatonic scale of the key in which a passage of music is written.
- (not comparable) Characterized or caused by, or relating to, colour or hue.
- (not comparable, graph theory) Relating to colorings of graphs.
- based on a scale consisting of 12 semitones
- being or having or characterized by hue
- able to refract light without spectral color separation