noun \ˈkü-mə-rən\

Definition of COUMARIN

: a toxic white crystalline lactone C9H6O2 with an odor of new-mown hay found in plants or made synthetically and used especially in perfumery and as the parent compound in various anticoagulant agents (as warfarin); also : a derivative of this compound

Seen & Heard

What made you want to look up coumarin? Please tell us where you read or heard it (including the quote, if possible).