WordNet (r) 3.0 (2006):

proton
    n 1: a stable particle with positive charge equal to the
         negative charge of an electron

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "proton":
   Kern, NMR, alpha particle, antibaryon, antilepton, antimeson, atom,
   atomic nucleus, atomic particle, baryon, beta particle, electron,
   elementary particle, ion, lepton, meson, molecule, monad, neutron,
   nuclear force, nuclear magnetic resonance, nuclear particle,
   nuclear resonance, nucleon, nucleosynthesis, nucleus, photon,
   quark, strangeness, strong interaction, triton, valence electron



The Free On-line Dictionary of Computing (30 December 2018):

PROTON

   1. A home computer made by Acorn Computers under a contract
   won from the BBC in April 1981.

   [Details?]

   2. Something to do with Microsoft SoftLib?

   (1994-11-28)