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relativistic mass

noun, Physics.
1.
the mass of a body in motion relative to the observer: it is equal to the rest mass multiplied by a factor that is greater than 1 and that increases as the magnitude of the velocity increases.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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relativistic mass in Science
relativistic mass
  (rěl'ə-tə-vĭs'tĭk)   
In Special and General Relativity, the observed mass of an object moving with respect to the observer. The relativistic mass is a function of the rest mass and the velocity of the object. Compare rest mass.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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