Any of several flavonoids that have a 3-hydroxyflavone backbone(noun)
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Use "flavonol" in a sentence
"Lemons and limes contain flavonoid compounds called flavonol glycosides."
"A particular flavonol, epicatechin, or EC, which is also found in red wine, is said to be responsible for much of dark chocolate's effects of increased blood circulation to the heart, extremities and brain."
"And to compound that, insects usually reject the seeds, because they contain toxic flavonol glycosides—in other words, they taste awful."