Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

flavonoid

play
noun fla·vo·noid \ˈflā-və-ˌnȯid\

Definition of flavonoid

  1. :  any of a group of oxygen-containing aromatic antioxidant compounds that includes many common pigments (as the anthocyanins and flavones)



Origin of flavonoid

flavone + -oid


First Known Use: 1947


Medical Dictionary

1

flavonoid

play play
adjective fla·vo·noid \ˈflāv-ə-ˌnȯid, ˈflav-\

Medical Definition of flavonoid

  1. :  of, relating to, or being a flavonoid




2

flavonoid

noun fla·vo·noid

Medical Definition of flavonoid

  1. :  any of a large group of typically biologically active, water-soluble, plant compounds (such as the flavones) that include pigments ranging in color from yellow to red to blue and occur especially in fruits, vegetables, and herbs (such as grapes, citrus fruits, peppers, and dill) <Tea contains substances called catechins (tea flavonoids) that may protect against heart disease and even cancer.—UC Berkeley Wellness Newsletter, November 1999> <Flavonoids are effective scavengers of free radicals in the test tube (in vitro). However, even with very high flavonoid intakes, plasma and intracellular flavonoid concentrations in humans are likely to be 100 to 1000 times lower than concentrations of other antioxidants …—Jane Higdon, An Evidence-Based Approach to Dietary Phytochemicals, 2007> Flavonoids are polyphenolic 15-carbon compounds with a basic structure consisting of two benzene rings joined by a chain of 3 carbons. —see bioflavonoid




Learn More about flavonoid


Seen and Heard

What made you want to look up flavonoid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a timid, meek, or unassertive person

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alt-5746713d76276

Which of these is a synonym of nonplus?

soothe disapprove reduce perplex
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ