Definition of antiparticle noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈæntipɑːtɪkl//
; NAmE NAmE//ˈæntipɑːrtɪkl//
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a very small part of an atom that has the same mass as a normal particle but the opposite electrical charge Wordfinderantiparticle, atom, electron, ion, neutron, nucleus, particle, positron, proton, valency
See the Oxford Advanced American Dictionary entry: antiparticle