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rest mass

noun, Physics.
1.
the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body.
Origin
1910-1915
1910-15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rest mass

rest mass

noun
1.
the mass of an object that is at rest relative to an observer. It is the mass used in Newtonian mechanics
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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rest mass in Medicine

rest mass n.
The physical mass of a body when it is regarded as being at rest.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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rest mass in Science
rest mass  
In Special and General Relativity, the observed mass of a body that is not in motion with respect to the observer. Also called invariant mass. Compare relativistic mass.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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