Antiproton

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The antiparticle of the proton, having a negative electric charge.

    "There were also particles no one had predicted that just appeared. Five of them […, i]n order of increasing modernity, […] are the neutrino, the pi meson, the antiproton, the quark and the Higgs boson."

  2. 2
    an unstable negatively charged proton; the antiparticle of a proton wordnet

Synonyms

All synonyms
pbarpbar

Example

More examples

"There were also particles no one had predicted that just appeared. Five of them […, i]n order of increasing modernity, […] are the neutrino, the pi meson, the antiproton, the quark and the Higgs boson."

Etymology

From anti- + proton.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.