antiparticle

Other forms: antiparticles

Definitions of antiparticle
  1. noun
    a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy
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    type of:
    elementary particle, fundamental particle
    (physics) a particle that is less complex than an atom; regarded as constituents of all matter
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