muon Munychion • Muong · · · Info · Definitions · Synonyms · Characters · · muon · · Text Latin · · Script 4 · · Length 2 · · Syllables Definitions · · · (noun) an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino. Synonyms: negative muon, mu-meson. · · Noun Definition 1 Synonyms · · · negative muon · · Synonym 1 mu-meson · · Synonym 2 Characters · · m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F u latin small letter u U+0075