American English

Definition of antiparticle noun from the Oxford Advanced American Dictionary

 

antiparticle

 noun
noun
NAmE//ˈæntiˌpɑrt̮ɪkl//
 
, NAmE//ˈæntaɪ‑//
 
(physics)
 
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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
See the Oxford Advanced Learner's Dictionary entry: antiparticle