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lepton
lep·ton [ lép tòn ] (plural lep·tons)


noun 
Definition:
 
subatomic particle: a fundamental subatomic particle that interacts only weakly with other particles, e.g. the electron, muon, neutrino, and their antiparticles
[Mid-20th century. < Greek leptos "small"]

lep·ton·ic [ lep tónnik ] adjective
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