antiproton

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an·ti·pro·ton

 (ăn′tē-prō′tŏn′, ăn′tī-)
n.
The antiparticle of the proton.

antiproton

(ˈæntɪˌprəʊtɒn)
n
(Atomic Physics) the antiparticle of the proton; a particle having the same mass as the proton but an equal and opposite charge

an•ti•pro•ton

(ˈæn tiˌproʊ tɒn, ˈæn taɪ-)

n.
the antiparticle of the proton, having negative charge but the mass and spin of the proton.
[1935]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.antiproton - an unstable negatively charged proton; the antiparticle of a proton
nucleon - a constituent (proton or neutron) of an atomic nucleus
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