polyphenol

[pol-ee-fee-nawl, -nol]
noun Chemistry.
a polymeric phenol.

Origin:
1895–1900; poly- + phenol

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American Heritage
Science Dictionary
polyphenol   (pŏl'ē-fē'nôl', -nōl')  Pronunciation Key 
Any of various alcohols containing two or more benzene rings that each have at least one hydroxyl group (OH) attached. Many polyphenols occur naturally in plants and some kinds, such as the flavonoids and tannins, are believed to be beneficial to health.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
So the coffee polyphenols do seem to stop amyloid fibrils from forming, similar to the tea polyphenol.
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