relativistic-mass

relativistic mass

noun Physics.
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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Science Dictionary
relativistic mass   (rěl'ə-tə-vĭs'tĭk)  Pronunciation Key 
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.
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