[1] : The Collaborative International Dictionary of English v.0.48

lepton \lepton\ n. physics
   an elementary particle that participates in weak interactions
   but does not participate in the strong interaction; it has a
   baryon number of 0. some known leptons are the electron,
   the negative muon, the tau-minus particle, and the
   neutrinos associated with each of these particles.
   wordnet 1.5 +pjc
see also:
electron negative muon tau-minus particle 

[2] : WordNet (r) 2.0

tau-minus particle
     n : a lepton of very great mass syn: tauon
see also:
tauon 

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