/ Dictionary / Index L leaded: Meaning and Definition of Find definitions for: lead•ed Pronunciation: (led'id), [key] — adj. (of gasoline) containing tetraethyllead. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: leaded (Thesaurus) lead dioxide leaden Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language