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Noun: antiparticle  'an,tI,paa(r)-ti-kul or 'an-tee,paa(r)-ti-kul [N. Amer], 'an-tee,paa(r)-ti-kul [Brit]
  1. 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

Derived forms: antiparticles

Type of: elementary particle, fundamental particle

Part of: antimatter

Encyclopedia: Antiparticle