MUONS

muon

[myoo-on]
noun Physics.
a lepton similar in most respects to the electron except that it is unstable, it may be positively charged, and its mass is approximately 207 times greater; the positively charged muon is the antiparticle of the negatively charged muon. Symbol: μ

Origin:
1950–55; by shortening of mu meson; see mu, -on1

muonic, adjective
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World English Dictionary
muon (ˈmjuːɒn)
 
n
a positive or negative elementary particle with a mass 207 times that of an electron and spin ½. It was originally called the mu meson but is now classified as a lepton
 
[C20: short for mu meson]
 
muonic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
muon   (my'ŏn')  Pronunciation Key 
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 × 10-6 seconds. The muon was originally called the mu-meson and was once thought to be a meson. See Table at subatomic particle.
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