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n. A fragrant crystalline compound, C9H6O2, extracted from several plants, such as tonka beans and sweet clover, or produced synthetically and widely used in perfumes.

n. the bicyclic aromatic compound 1,2-benzopyrone or any of its derivatives

n. 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.

n. A vegetable proximate principle (C9H9O2) obtained from the Dipteryx (Coumarouna) odorata or Tonka bean, and also occurring in melilot and some other plants, to which it gives its characteristic odor.

"The aromatic compound in bison grass is called coumarin."

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