COUMARIN

noun Etymology: French ~e, from coumarou tonka bean tree, from Spanish or Portuguese; Spanish cumarú, from Portuguese, from Tupi *kumarú, *kumbarú Date: 1830 a toxic white crystalline lactone C 9 H 6 O 2 with an odor of new-mown hay found in plants or made synthetically and used especially in perfumery and as a parent compound in anticoagulant agents