Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

rest mass

noun

Definition of rest mass

  1. :  the mass of a body exclusive of additional mass the body acquires by its motion according to the theory of relativity




Learn More about rest mass


Seen and Heard

What made you want to look up rest mass? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

of striking ability or excellence

Get Word of the Day daily email!