, a. Silent and idle. [Colloq.]
[1913 Webster]

Boys can't sit mum-chance always.
J. H. Ewing.
[1913 Webster]



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 1.5]


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Mon 09th December 2019