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What is a coumarin?

What is a coumarin? Here are some definitions.

Noun
  1. (organic chemistry) the bicyclic aromatic compound 1,2-benzopyrone or any of its derivatives
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However, the use of natural coumarin in food was banned in the USA in 1954, and the use of tonka beans restricted to perfume.
The active principle is in the defatted portion of the seed, which contains the alkaloid trigonelline, nicotinic acid, and coumarin.
If coumarin is present, a brown, precipitate will form, and if stirred with a rod it will collect in dark green flecks.
These researches incidentally solved the constitution of coumarin, the odoriferous principle of woodruff.
The benefit of benzopyrones, such as coumarin or flavonoids, remains unproved.
The spectrum of coumarin in uncomplexed DNA is shown as the solid curve.

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