American Heritage® Dictionary of the English Language, Fourth Edition
- n. A colorless crystalline compound, C7H6O5, derived from tannin and used as a tanning agent, as an ink dye, and in photography and the manufacture of paper.
- n. chemistry a phenolic carboxylic acid, 3,4,5-trihydroxybenzoic acid, found in galls, tea, the bark of some trees etc; a constituent of tannin
- n. chemistry the supposed acid H3GaO3, the acid form of amphoteric gallium hydroxide Ga(OH)3, known only as alkali metal salts
GNU Webster's 1913
- adj. (Chem.) an organic acid, very widely distributed in the vegetable kingdom, being found in the free state in galls, tea, etc., and produced artificially. It is a white, crystalline substance, C6H2(HO)3.CO2H, with an astringent taste, and is a strong reducing agent, as employed in photography. It is usually prepared from tannin, and both give a dark color with iron salts, forming tannate and gallate of iron, which are the essential ingredients of common black ink.
- n. a colorless crystalline acid obtained from tannin
- French acide gallique, from galle, plant gall; see gall3. (American Heritage® Dictionary of the English Language, Fourth Edition)
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