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 ( 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

For example, the skin of an apple contains quercetin, a powerful antioxidant, along with much of the fruit’s dietary fiber.

From Salon • Jan. 12, 2025

These tests confirmed that quercetin was a good inhibitor.

From Salon • Dec. 16, 2024

If the combination of quercetin and ethanol causes headaches, why is it that some people can drink red wine without any effect, while others experience headaches when they drink it?

From Salon • Dec. 13, 2023

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