keratometry
paragravity
passive gravitational mass
absolute system
densitometer
zenith telescope
magnetogravimetric
gravitoelectromagnetism
isogravitational
doorstopper
bigravity
telescopical
tattler
gravitaxic
gravitropically
potmeter
air reconnaissance
transit instrument
dioptric
rainmeter
gravistimulation
astrointerferometer
slingshot
theodolite
telescopic
potentiometrically
platometer
transit
reflector
Crookes radiometer
raft
principle of equivalence
strainometer
refractor
thoracometer
perspective glass
microgravimetry
telescopist
robodoc
astronomy satellite
astronomical telescope