relativistic mass

Noun
  1. (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 (synset 105032295)
    referred to in: natural philosophy, physics - the science of matter and energy and their interactions
    is a type of: mass - the property of a body that causes it to have weight in a gravitational field

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