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.
... record, in this country, was one against time, which occurred in the year 1604, when John Lepton,[6] a groom, in the service of King James I., undertook to ride five times between London and York, from Monday morning until Saturday night, and actually performed the task ... — The Mirror of Literature, Amusement, and Instruction - Volume 19. Issue 548 - 26 May 1832 • Various Read full book for free!
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