(French), from coumarou, a tree of Guiana.
(Chemistry) 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.
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coumarin (plural coumarins) (organic chemistry) the bicyclic aromatic compound 1,2-benzopyrone or any of its derivatives
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