| Pion 1. (n.) The edible seed of several species of pine; also, the tree producing such seeds, as Pinus Pinea of Southern Europe, and P. Parryana, cembroides, edulis, and monophylla, the nut pines of Western North America. 2. (n.) See Monkey's puzzle. Thesaurus Entries K-meson, Kern, NMR, alpha particle, antibaryon, antilepton, antimeson, atomic nucleus, atomic particle, baryon, beta particle, electron, elementary particle, graviton, lepton, meson, mesotron, nuclear force, nuclear magnetic resonance, nuclear particle, nuclear resonance, nucleon, nucleosynthesis, nucleus, photon, pion, proton, quark, strangeness, strong interaction, triton, valence electron | ![]() |