[lep.ton] n, pl lep.ta [NGk, fr. Gk, a small coin, fr. neut. of leptos peeled, slender, small, fr. lepein to peel--more at leper] (ca. 1741): a monetary unit of Greece equal to 1/100 drachma
[2]lep.ton n [Gk leptos + E
[2]-on] (ca. 1929): any of a family of particles (as electrons, muons, and neutrinos) that have spin quantum number 1/2 and that experience no strong forces -- lep.ton.ic adj