gallic,
a. [From
Gall the excrescence.].
Pertaining to, or derived from, galls, nutgalls, and the like. [1913 Webster]
Gallic acid (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.
gallic, a. [L. Gallicus belonging to the Gauls, fr. Galli the Gauls, Gallia Gaul, now France: cf. F. gallique.].