/ Dictionary / Index L lactonize: Meaning and Definition of Find definitions for: lac•to•nize Pronunciation: (lak'tō-nīz"), [key] — -nized, -niz•ing. to change into a lactone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lactone lacto-ovo-vegetarian Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language