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restful
restharrow
restiform
resting
resting spore
restitution
restive
restless
restless leg syndrome
restless legs syndrome
restock
Restoration
restoration
restorative
restore
restrain
restrained
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rest mass
rest mass (plural rest mass·es)


noun 
Definition:
 
mass of immobile object: the mass a body has when it is not moving, as opposed to the additional mass it gains as a result of its movement, according to the theory of relativity
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