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Noun: antiproton  ,an,tI'prow,tón or ,an-tee'prow,tón [N. Amer], ,an-tee'prow,tón [Brit]
  1. An unstable negatively charged proton; the antiparticle of a proton
    "Antiprotons were first produced artificially in 1955"

Derived forms: antiprotons

Type of: nucleon

Encyclopedia: Antiproton