/ Dictionary / Index C coumarin: Meaning and Definition of Find definitions for: cou•ma•rin Pronunciation: (k'mu-rin), [key] — n. a fragrant crystalline substance, CHO, obtained from the tonka bean, sweet clover, and certain other plants or prepared synthetically, used chiefly in soaps and perfumery. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Coumadin coumarone Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language