gallic acidgal·lic acid
a nearly colorless, crystalline acid, (OH)CHCOOH, prepared from tannins, etc. and used in photography and the manufacture of inks, dyes, etc.
Origin of gallic acidFrench gallique from galle, gall
A colorless crystalline polyphenol, C7H6O5, derived from certain tannins and used as a tanning agent, as an ink dye, in photography, and in pharmaceuticals.
Origin of gallic acidFrench acide gallique from galle plant gall ; see gall 3.