/an"tee pahr'ti keuhl, an"tuy-/, 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).
[1930-35; ANTI- + PARTICLE]

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       subatomic particle having the same mass as one of the particles of ordinary matter but opposite electric charge and magnetic moment. Thus, the positron (positively charged electron) is the antiparticle of the negatively charged electron. The spinning antineutron, like the ordinary neutron, has a net electric charge of zero, but its magnetic polarity is opposite to that of a similarly spinning neutron. The neutrino, a massless uncharged particle that travels at the speed of light, spins counterclockwise as viewed from behind, whereas the antineutrino (antineutron) spins clockwise as viewed from behind. A particle and its antiparticle mutually react to produce energy by annihilation.

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Universalium. 2010.

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