Dictionary  an•ti•par•ti•clePronunciation: (an'tē-pär"ti-kul, an'tī-), [key] —n. Physics. a particle all of whose properties, as mass, spin, or charge, have the same magnitude as but, where appropriate, the opposite sign of a specific elementary particle; neutral pions, photons, and gravitons are considered to be their own antiparticles: The positron is the antiparticle of the electron. Cf. antimatter, annihilation (def. 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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