gallic acid

American  

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.

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gallic acid British  

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: C 6 H 2 (OH) 3 COOH

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Etymology

Origin of gallic acid

First recorded in 1785–95, gallic acid is from French acide gallique

Example Sentences

By comparison, he added, other species of azolla that grow in Asia and Africa are between 20 and 69 grams, gallic acid equivalents per kilogram dry weight -- too high for humans to digest comfortably.

From Science Daily • Feb. 23, 2024

The researchers determined that Carolina azolla has a total phenolic content of about 4.26 grams, gallic acid equivalents per kilogram dry weight.

From Science Daily • Feb. 23, 2024

It contains gallic acid and tannin, and is used for dyeing drab.

From Webster's Unabridged Dictionary (2nd 100 Pages) by Webster, Noah

I excite my paper with equal proportions of saturated solution of gallic acid and aceto-nitrate of silver, one or two drops of each to the drachm of distilled water.

From Notes and Queries, Number 229, March 18, 1854 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc by Various

Chemists have extracted from it an astringent liquor containing tannin and gallic acid.

From Curiosities of Medical Experience by Millingen, J. G. (John Gideon)