n.
Pronunciation: ' kü-m ə -r ə n
Function: noun
Etymology: French coumarine, 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 also : a derivative of this compound