ˈga]lik-, ˈgȯ], ]lēk-\ noun
Etymology: part translation of French acide gallique, from acide acid + gallique of gall, derived from gall, from galle gall + -ique -ic — more at gall (excrescence)
: a white crystalline acid C 6 H 2 (OH) 3 COOH.H 2 O that occurs widely in plants both in the free form (as in galls and in tea leaves) and combined in tannins from which it can be obtained by the action of molds or alkali and that is used chiefly in making pyrogallol, dyes, and writing ink and as a photographic developer; 3,4,5-trihydroxy-benzoic acid