gallic acid
noun
gal·lic acid ˈga-lik- 
ˈgȯ-lik-
ˈgȯ-lik- : a white crystalline acid C7H6O5 found widely in plants or combined in tannins and used especially in dyes and as a photographic developer
Example Sentences
Recent Examples on the Web Caffeine, gallic acid, p-coumaric acid and kaempferol all improve the diversity and quantity of honeybee gut microbes, researchers reported last year in the Journal of Applied Microbiology. 
Berly Mccoy, Smithsonian Magazine, 25 Oct. 2021 How much gallic acid is there normally in a human colon? Hannah Seo, Popular Science, 20 Aug. 2020 When the team eliminated gut bacteria in mice, but then administered gallic acid on its own, the resulting tumor growth pattern looked as if the entire microbiome had been intact. Hannah Seo, Popular Science, 20 Aug. 2020
Berly Mccoy, Smithsonian Magazine, 25 Oct. 2021 How much gallic acid is there normally in a human colon? Hannah Seo, Popular Science, 20 Aug. 2020 When the team eliminated gut bacteria in mice, but then administered gallic acid on its own, the resulting tumor growth pattern looked as if the entire microbiome had been intact. Hannah Seo, Popular Science, 20 Aug. 2020 Word History
Etymology
borrowed from French (acide) gallique, from galle gall entry 3 + -ique -ic entry 1
First Known Use
1788, in the meaning defined above
Medical Definition
gallic acid
noun
gal·lic acid ˌgal-ik- ˌgȯ-lik-
ˌgȯ-lik- : a white crystalline acid C7H6O5 found widely in plants or combined in tannins and used especially in dyes and writing ink and as a photographic developer