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
Source: WordNetThe alternative physics is a physics of light. Light is composed of photons, which have no antiparticle. This means that there is no dualism in the world of light. Terence McKenna
Antineutrinos are another kind of antiparticle created by natural radioactivity (β − decay). Source: Internet
Antineutrinos are another kind of antiparticle produced by natural radioactivity (β − decay). Source: Internet
A photon can also be emitted when a particle and its corresponding antiparticle are annihilated (for example, electron–positron annihilation ). Source: Internet
Each Feynman diagram is the sum of exponentially many old-fashioned terms, because each internal line can separately represent either a particle or an antiparticle. Source: Internet
Besides mediating an extremely feeble force, the graviton would have its own antiparticle and rapidly annihilate, rendering its detection extremely difficult even if it exists. Source: Internet