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

 

positron

 noun
noun
BrE BrE//ˈpɒzɪtrɒn//
 
; NAmE NAmE//ˈpɑːzɪtrɑːn//
 
(physics)
 
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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 Origin 1930s: from positive + -tron.
See the Oxford Advanced American Dictionary entry: positron