n. (pl. lepta) a Greek coin worth one-hundredth of a drachma.
Etymology: Gk lepton (nomisma coin) neut. of leptos small
2.
n. (pl. leptons) Physics any of a class of elementary particles which do not undergo strong interaction, e.g. an electron, muon, or neutrino.
Etymology: LEPTO- + -ON
Useful english dictionary. 2012.