luminal
lumic
SOL
lightspeed
superlumic
sub-light
rapidity
fleet
index of refraction
refractive index
nonrelativistic
subluminally
relativistic
gossamer-thin
superluminal
sublumic
luxon
superluminary
play
shimmer
wane
aeriform
Planck acceleration
subrelativistic
light minute
light speed
speed of light
c
photophysics
unclockable
tardyon
superluminally
speedlessness
superlight
subluminary
flicky
subluminal
tachyonic
photon tunnelling
luxonic
emission theory
faster-than-light
airy
ethereal
aerial
clock rate
light hour
aery
wan
practical light
Einstein barrier
flickering
pale
sick
coherent light
unbright
pallid
hyperlight
special relativity theory
special theory of relativity
rest energy
special relativity
occulting light
warm dark matter
Einstein's special theory of relativity
expressness
nonrelativistic mechanics
retardation
unpaced
Tyndall effect
light day
dense
afterlight
ultrarelativistic
impenetrable
celerity
heavy
jump
nimble
deceleration
opaqueness
lightlessness
twilight
light second
opacity
owl light
time dilation
from can see to can't see
information velocity
transparently
æther wave
luminous flux
speedometry

English words for 'light-speed; having the speed of light (usually in the void)'

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