Antiparticle Definition

ăntē-pärtĭ-kəl, ăntī-
antiparticles
noun
A subatomic particle, such as a positron or antiproton, having the same spin, magnitude of electric charge, magnitude of magnetic moment, mass, and mean lifetime as the particle to which it corresponds, but the opposite sign of charge, opposite direction of magnetic moment, and opposite intrinsic parity.
American Heritage
Any of the constituent particles of antimatter.
Webster's New World

(physics) A subatomic particle corresponding to another particle with the same mass, spin and mean lifetime but with charge, parity, strangeness and other quantum numbers flipped in sign.

Wiktionary

Other Word Forms of Antiparticle

Noun

Singular:
antiparticle
Plural:
antiparticles

Origin of Antiparticle

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antiparticle