flavone
noun
fla·vone ˈflā-ˌvōn 
: a colorless crystalline aromatic ketone C15H10O2 found in the leaves, stems, and seed capsules of many primroses
also : any of the derivatives of this ketone many of which occur as yellow plant pigments in the form of glycosides and are used as dyestuffs
Example Sentences
Recent Examples on the Web Given the limited scientific data available in humans, the remnants of your crunchy crudité provide antioxidants called flavones. 
Jaclyn London, Ms, Rd, Cdn, Good Housekeeping, 16 Jan. 2019 Additional study of the blue chrysanthemums revealed that the observed color was in fact due to the combined effects of delphinidin and a class of copigments called flavones that are commonly found in flowers. Jordan C. Axelson, Milwaukee Journal Sentinel, 26 July 2017
Jaclyn London, Ms, Rd, Cdn, Good Housekeeping, 16 Jan. 2019 Additional study of the blue chrysanthemums revealed that the observed color was in fact due to the combined effects of delphinidin and a class of copigments called flavones that are commonly found in flowers. Jordan C. Axelson, Milwaukee Journal Sentinel, 26 July 2017 Word History
Etymology
International Scientific Vocabulary, from Latin flavus
First Known Use
1897, in the meaning defined above
Medical Definition
flavone
noun
fla·vone ˈflā-ˌvōn
: a colorless crystalline ketone C15H10O2 found in the leaves, stems, and seed capsules of many primroses
also : any of the derivatives of this ketone many of which occur as yellow plant pigments in the form of glycosides and are used as dyestuffs