antiprotonn.
/ˈantɪˌprəʊtɒn/, U.S. /ˈæn(t)iˌproʊˌtɑn/, /ˈænˌtaɪˌproʊˌtɑn/, /ˈæn(t)əˌproʊˌtɑn/ Particle Physics.
The antiparticle of the proton, having the same mass as the proton and a numerically equal but negative electric charge. Cf. antiparticle n.
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antiproton1931
1931 P. A. M. Dirac in Proc. Royal Soc. A. 133 62 Presumably the protons will have their own negative-energy states, all of which normally are occupied, an unoccupied one appearing as an anti-proton.
1955 N.Y. Times 23 Oct. e9/6 (heading) Discovery of the Anti-Proton Ends a Long Search.
2010 Nature 18 Nov. 379/4 Antihydrogen, the bound state of an antiproton and a positron, has been produced at low energies at CERN, Europe's particle-physics lab in Geneva, Switzerland, since 2002.
This entry has been updated (OED Third Edition, March 2022).
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n.1931