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muon
Definitions
[ˈmjuːɒn], (Noun)
Definitions:
- an unstable subatomic particle of the same class as an electron (a lepton), but with a mass around 200 times greater. Muons make up much of the cosmic radiation reaching the earth's surface
Phrases:
Origin
:
1950s: contraction of mu-meson; the particle, however, is no longer regarded as a meson
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definition by Oxford Dictionaries