COUMARIN

[cou.ma.rin] n [F coumarine, fr. coumarou tonka bean tree, fr. Sp or Pg; Sp cumaru, fr. Pg, fr. Tupi kumaru] (1830): a toxic white crystalline lactone with an odor of new-mown hay found in plants or made synthetically and used esp. in perfumery; also: a derivative of this compound