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gallic acid Line breaks: gal¦lic acid
Pronunciation: /ˈɡalɪk/

Definition of gallic acid in English:


[mass noun] Chemistry
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.


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

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