D defs.my
Entry 1 sense Webster, 1913

lepton

· IPA /ˈlɛptɒn/
01 n. an elementary particle that participates in weak interactions but does not participate in the strong interaction; it has a baryon number of…
  1. 1.
    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.(Physics)