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gallic acid

noun, Chemistry
1.
a white or yellowish, crystalline, sparingly water-soluble solid, C 7 H 6 O 5 , obtained from nutgalls, used chiefly in tanning and in ink dyes.
Origin
1785-1795
1785-95; < French acide gallique
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for gallic-acid

gallic acid

noun
1.
a colourless crystalline compound obtained from tannin: used as a tanning agent and in making inks, paper, and pyrogallol; 3,4,5-trihydroxybenzoic acid. Formula: C6H2(OH)3COOH
Word Origin
C18: from French gallique; see gall³
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for gallic-acid

gallic acid

substance occurring in many plants, either in the free state or combined as gallotannin. It is present to the extent of 40-60 percent combined as gallotannic acid in tara (any of various plants of the genus Caesalpinia) and in Aleppo and Chinese galls (swellings of plant tissue), from which it is obtained commercially by the action of acids or alkalies. An Aleppo gall has a spherical shape, is hard and brittle, and is about the size of a hickory nut; it is produced on oak twigs by a gall wasp (Cynips tinctoria). A Chinese gall is produced by insects on Asian sumac (Rhus semialata).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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9
13
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