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Webster 1913 Edition

Noun.

[G.

fisett

holz a species of fustic.]

(Chem.)

A yellow crystalline substance extracted from fustet, and regarded as its essential coloring principle; – called also

fisetic acid

fisetin ‎(uncountable)

(organic chemistry) A particular flavonol, 2-(3,4-dihydroxyphenyl)-3,7-dihydroxychromen-4-one, found in several plants