/ Dictionary / Index A antilepton: Meaning and Definition of Find definitions for: an•ti•lep•ton Pronunciation: (an"tē-lep'ton, an"tī-), [key] — n. Physics. the antiparticle of a lepton. Cf. antineutrino, muon, positron, tau lepton. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: antilepton (Thesaurus) antilegomena antilife Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language