/ Dictionary / Index L lactic: Meaning and Definition of Find definitions for: lac•tic Pronunciation: (lak'tik), [key] — adj. of, pertaining to, or obtained from milk. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lactic (Thesaurus) lacti- lactic acid Related Content Daily Word Quiz: slough Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language