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[2x]
: MÜ Mä Mæ Mé Mê Mö Mœ M- M. M1 M2 M3 M< Ma Mb Mc Md Me Mf Mg Mh Mi Mk Ml Mm Mn Mo Mp Mr Ms Mt Mu Mv Mw Mx My
mu-meson
CIDE DICTIONARY
mu-meson, n.
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. [WordNet 1.5]
For further exploring for "mu-meson" in Webster Dictionary Online