quercetin

American  

[kwur-si-tin] / ˈkwɜr sɪ tɪn /

noun

Chemistry.

1. a yellow, crystalline, slightly water-soluble powder, C 1 5 H 1 0 O 7 , obtained from the bark of the quercitron and other vegetable substances, used as a yellow dye; flavin.

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quercetin British  

/ ˈkwɜːsɪtɪn, kwɜːˈsɛtɪk, -ˈsiː- /

noun

1. Also called: flavin.  a yellow crystalline pigment found naturally in the rind and bark of many plants. It is used in medicine to treat fragile capillaries. Formula: C 15 H 10 O 7 ; melting pt: 316–7°C

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Other Word Forms

• quercetic adjective

Etymology

Origin of quercetin

1855–60; < New Latin quercēt ( um ) an oak grove ( Latin querc ( us ) oak ( see quercine) + -ētum suffix of places where a given plant grows) + -in ²

Example Sentences

Plant-based supplements containing quercetin, curcumin, and piperine improved fatigue compared with placebo.

From Science Daily • Jan. 8, 2026

Our enzyme tests suggest that quercetin glucuronide disrupts your body's metabolism of alcohol.

From Salon • Dec. 16, 2024

These tests confirmed that quercetin was a good inhibitor.

From Salon • Dec. 16, 2024

The next step could be to give human subjects two red wines that are low and high in quercetin and ask whether either wine causes a headache.

From Salon • Dec. 16, 2024

The colouring principle of Quercitron Bark is called quercitrin, which by the action of boiling mineral acid solutions is decomposed, with the production of the true colouring matter termed quercetin.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" by Various