polyphenol

noun

poly·​phe·​nol ˌpä-lē-ˈfē-ˌnōl 

-fi-ˈnōl

: a polyhydroxy phenol

especially : an antioxidant phytochemical

polyphenolic

ˌpä-lē-fi-ˈnō-lik  -ˈnä- 

adjective

Examples of polyphenol in a Sentence

Recent Examples on the Web

The polyphenols in red grapes, specifically quercetin, myricetin, and resveratrol, may intervene with these diabetic complications. — Kathi Valeii Published, Verywell Health, 8 July 2026

Specifically, walnuts contain antioxidants called polyphenols, including ellagitannins and ellagic acid, says Roach. — Kirsten Nunez, Martha Stewart, 4 July 2026

Among the antioxidants in pomegranates, Syn notes, are polyphenols called anthocyanins, which give the fruit its deep red color. — Daryl Austin, USA Today, 2 July 2026

Even if cherries aren’t your thing, there are plenty of other fruits that provide anti-inflammatory benefits and can even help your gut thanks to the presence of powerful antioxidants (like polyphenols and vitamin C) and fiber. — Laura Solla, Vogue, 1 July 2026

Word History

Etymology

International Scientific Vocabulary

First Known Use

1894, in the meaning defined above

Rhymes for polyphenol

• nitrophenol
• allopurinol
• dinitrophenol
• eugenol
• pentachlorophenol
• phenol

Medical Definition

polyphenol

noun

poly·​phe·​nol ˌpäl-i-ˈfē-ˌnōl, -ˌnȯl, -fi-ˈ 

: a polyhydroxy phenol

especially : an antioxidant phytochemical (as chlorogenic acid) that tends to prevent or neutralize the damaging effects of free radicals

polyphenolic

-fi-ˈnō-lik  -ˈnäl-ik 

adjective