Cite
 

Meaning of pion

pi•on

Pronunciation: (pī'on), [key]
— n. Physics.
  1. the first meson to be discovered: it has spin 0 and may be positively or negatively charged or neutral; charged pions decay into a muon and a neutrino or antineutrino. Symbol: &pgr;&hasp; Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: