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



BrE BrE//ˈpɒzɪtrɒn//
; NAmE NAmE//ˈpɑːzɪtrɑːn//
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a particle in an atom which has the same mass as an electron and an equal but positive charge Wordfinderantiparticle, atom, electron, ion, neutron, nucleus, particle, positron, proton, valency Word Origin1930s: from positive + -tron.
See the Oxford Advanced American Dictionary entry: positron