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 (pŏl′ē-fē′nôl′, -nōl′, -nŏl′)
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.

pol′y·phe·no′lic (-fĭ-nō′lĭk, -nŏl′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Chemistry) chem relating to a polyphenol
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Kava extract powder is used as a herbal remedy in the form of an extract called seanol, a polyphenolic extract.
Plant extracts, such as extract of scent leaf, aqueous garlic extract, onion juice, as well as a fraction of substances extracted from Emilia sonchifolia and polyphenolic compounds of Camelia sinensis have been proven to ameliorate cataract induced by chemical substances such as selenite.
BP-C1 is an anti-neoplastic agent with palliative properties and is based on Meabco's patented polyphenolic technology platform.
Plants synthesize secondary metabolites such as terpenes, saponins, glycosides and polyphenolic compounds that are not present in all living things as well as primary metabolites such as carbohydrates, proteins and fats in order to maintain their growth and liveliness (1).
Our previous work on polyphenolic extracts of herbs collected from Algeria showed potent anti-microbial activity against Helicobacter pylori, the causative agent of peptic ulcer in humans (12).
There is a lot of interest in extracting polyphenolic compounds from plant materials during processing.
Scientists at The University of Melbourne recently confirmed the presence of a significant quantity of polyphenolic compounds and flavonoids in Five10FibreTM.
Summary: The present study was conducted to determine the antioxidant and anti-bacterial activities; estimate total phenolic, polyphenolic and pigments contents in citrus sinensis.
P80, which contains a rare combination of five natural polyphenolic antioxidants -tannic acid, gallic acid, gamma-amino butyric acid, ellagic acid and corilagin, is extracted from high quality longan (commonly known as "dragon eye") fruit sourced from Northern Thailand.
The natural products with polyphenolic compounds is studied effective in altering the oral microbiota, suppress the development of dental biofilm and reduce the progression of dental caries.
On the other hand, several reports describe polyphenolic content of peel and seeds obtained from quince fruits [1, 16].