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

 

antiproton

 noun
noun
BrE BrE//ˈæntiprəʊtɒn//
 
; NAmE NAmE//ˈæntiproʊtɑːn//
 
(physics)
 
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a particle that has the same mass as a proton, but a negative electrical charge
See the Oxford Advanced American Dictionary entry: antiproton