quercetin

 
Pronunciation: /ˈkwəːsɪtɪn/

noun

[mass noun] Chemistry
  • a yellow crystalline pigment present in plants, used as a food supplement to reduce allergic responses or boost immunity.
    • A flavone derivative; chemical formula: C15H10O7

Origin:

mid 19th century: probably from Latin quercetum 'oak grove' (from quercus 'oak') + -in1