Muon meaning

myo͝oŏn
Frequency:
The negatively charged lepton that belongs to the second generation of elementary fermions and has a mass 207 times that of an electron and a mean lifetime of 2.2 × 10−6 second.
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(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.
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An unstable elementary particle in the lepton family, having similar properties to the electron but with a mass 209 times greater.
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An elementary particle in the lepton family having a mass 209 times that of the electron, a negative electric charge, and a mean lifetime of 2.2 × 10&spminus;6 seconds. The muon was originally called the mu-meson and was once thought to be a meson.
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Origin of muon

  • Earlier mu meson (from the use of the Greek letter mu, the equivalent of the Roman letter m of meson, to distinguish it from other mesons subsequently discovered, the class of particles to which it was formerly thought to belong)

    From American Heritage Dictionary of the English Language, 5th Edition

  • Contraction of mu-meson (the particle has now been recategorised as a lepton).

    From Wiktionary