Antiproton

Origin

- + proton

Full definition of antiproton

Noun

1. (physics) The antiparticle of the proton, having a negative electric charge.
• 2012, Jeremy Bernstein, A Palette of Particles, There were also particles no one had predicted that just appeared. Five of them in order of increasing modernity, … are the neutrino, the pi meson, the antiproton, the quark and the Higgs boson.