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English definition of “antiparticle”

antiparticle

noun [C]  /ˈænt·iˌpɑrt̬·ɪ·kəl, ˈæn·tɑɪ-/ us  
physics a particle that makes up antimatter, containing the same amount of matter but having the opposite electrical charge that a regular particle has
(Definition of antiparticle from the Cambridge Academic Content Dictionary © Cambridge University Press)
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