/ Dictionary / Index L leptophos: Meaning and Definition of Find definitions for: lep•to•phos Pronunciation: (lep'tu-fos"), [key] — n. Chem. a solid compound, CHBrClOPS, used as a nonsystemic insecticide for food crops and lawn grass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lepton number leptosome Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language