The Collaborative International Dictionary
mu-meson
mu-meson \mu-meson\, mu meson \mu meson\n. (Physics) an elementary particle with a negative charge and a half-life of 2 microseconds; the muon. It is a lepton, not a true meson, and decays to an electron and neutrino and antineutrino.
Syn: muon, negative muon.
WordNet
mu-meson
n. an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino [syn: muon, negative muon]