/ Dictionary / Index L lye: Meaning and Definition of Find definitions for: lye Pronunciation: (lī), [key] — n. Chem. a highly concentrated, aqueous solution of potassium hydroxide or sodium hydroxide. any solution resulting from leaching, percolation, or the like. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lye (Thesaurus) Lydian mode lyefish Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language