Gallic-acid meaning

găl'ĭk, gô'lĭk
A colorless crystalline polyphenol, C7 H6 O5 , derived from certain tannins and used as a tanning agent, as an ink dye, in photography, and in pharmaceuticals.
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A nearly colorless, crystalline acid, (OH)3C6H2COOH, prepared from tannins, etc. and used in photography and the manufacture of inks, dyes, etc.
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(chemistry) A phenolic carboxylic acid, 3,4,5-trihydroxybenzoic acid, found in galls, tea, the bark of some trees etc; a constituent of tannin.
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(chemistry) The supposed acid H3GaO3, the acid form of the amphoteric gallium hydroxide Ga(OH)3, known only as alkali metal salts.
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Origin of gallic-acid

French acide gallique from galle plant gall gall3