名詞 muon:

1. an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino
   同義詞：negative muon, mu-meson

mu.on

n.Physics （名詞）【物理學】
An elementary particle in the lepton family (not a meson), having a mass 209 times that of the electron, a negative electric charge, and a mean lifetime of 2.2 × 0-' second. Also called mu meson See table at subatomic particle
介子：輕子族中的一種基本微粒（非介子），其質量為電子的209倍，是一種負電荷，平均壽命為2.2×0-'秒 也作 mu meson參見 subatomic particle

來源：
Short for mu meson
mu meson的簡寫