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gallic acid Syllabification: gal·lic ac·id
Pronunciation: /ˈɡalik/ /ˈɡôlik/

Definition of gallic acid in English:


An acid extracted from oak galls and other vegetable products, formerly used in making ink.
  • Alternative name: 3, 4, 5-trihydroxybenzoic acid; chemical formula: C6H2(OH)3COOH
Example sentences
  • Pyrogallol, tannic acid, and gallic acid were obtained from Zhunyi Reagents (Guizou, China).
  • Modern compositions use other unstable, albeit somewhat less hazardous, aromatic compounds such as gallic acid or the salts of aromatic acids including sodium salicylate and potassium benzoate.
  • Then, the paper is floated on a mixture containing silver nitrate and gallic acid.


Pronunciation: /ˈɡalāt/ /ˈɡôlāt/
Example sentences
  • Not only is tea soothing, but green tea may reduce your appetite thanks to its active substance, epigallocatechin gallate, says Shutsung Liao, Ph.D., director of the Tang Center for Herbal Medicine Research at the University of Chicago.
  • Researchers prepared a second vial almost identical to the first but included a mixture of vitamin C, the amino acids L-lysine and L-proline and a green tea extract called epigallocatechin gallate.
  • It has very little caffeine, so you won't be overloaded if you sip some during the day, and it's the source of epigallocatechin gallate, the fat-loss compound used in some supplements.


Late 18th century: gallic from Latin galla 'oak gall' (see gall3) + -ic.

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