antiproton

American  

[an-tee-proh-ton, an-tahy-] / ˈæn tiˌproʊ tɒn, ˈæn taɪ- /

noun

Physics.

1. an elementary particle having negative charge equal in magnitude to that of the electron and having the same mass and spin as a proton; the antiparticle of the proton.

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antiproton British  

/ ˈæntɪˌprəʊtɒn /

noun

1. the antiparticle of the proton; a particle having the same mass as the proton but an equal and opposite charge

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antiproton Scientific  

/ ăn′tē-prō′tŏn′,ăn′tī- /

1. The antiparticle that corresponds to the proton.

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Etymology

Origin of antiproton

First recorded in 1935–40; anti- + proton