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Webster 1913 Edition

(koō′mȧ-rĭn)

Noun.

[F., fr.

coumarou

, a tree of Guiana.]

(Chem.)

The concrete essence of the tonka bean, the fruit of

Dipterix (formerly Coumarouna) odorata

and consisting essentially of coumarin proper, which is a white crystalline substance,

C9H6O2

, of vanilla-like odor, regarded as an anhydride of coumaric acid, and used in flavoring. Coumarin in also made artificially.

coumarin ‎(plural coumarins)

(organic chemistry) the bicyclic aromatic compound 1,2-benzopyrone or any of its derivatives

aromatic compound