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A more or less round gall resembling a nut, esp. one of those produced on the oak and used in the arts. See Gall, Gallnut.

Pertaining to, or derived from, galls, nutgalls, and the like. 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 st…

gall produced on the leaves and shoots of various species of the oak tree. See Gall, and Nutgall.

Pertaining to the tannin or nutgalls. Gallotannic acid. See Tannic acid, under Tannic.

from, or resembling, tan; as, tannic acid. Tannic acid. (Chem.) (a) An acid obtained from nutgalls as a yellow amorphous substance, C14H10O9, having an astringent taste, and forming with ferric salts a bluish-black compound, which is the basis of common ink. Called also tannin, and gallotannic acid.…