a positive or negative elementary particle with a mass 207 times that of an electron and spin 1⁄2. It was originally called the mu meson but is now classified as a lepton
Derived forms
muonic (mjuːˈɒnɪk)
adjective
Word origin
C20: short for mu meson
muon in American English
(ˈmjuˌɑn)
noun
Particle Physics
an unstable, negatively charged lepton with a mass of 105.7 MeV, c. 207 times that of an electron, and a mean lifetime of 2.2×10-6 second: it decays into an electron, a neutrino, and an antineutrino