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.
From
American Heritage Dictionary of the English Language, 5th Edition
Gallic-acid Sentence Examples
Potassium chlorate and hydrochloric acid oxidize phenol, salicylic acid (o-oxybenzoic acid), and gallic acid ([2.3.4] trioxybenzoic acid) to tri chlorpyroracemic acid (isotrichlorglyceric acid), CC13 C(OH)2 C02H, a substance also obtained from trichloracetonitrile, CC1 3 CO CN, by hydrolysis.
Its exports include timber, citrons, skins, chestnuts and gallic acid.
Tannic acid is absorbed as gallic acid into the blood and eliminated as gallic and pyrogallic acids, darkening the urine.
Unlike tannic acid, gallic acid does not precipitate albumen or salts of the alkaloids, or, except when mixed with gum, gelatin.