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Quercite Quer"cite, n. (Chem.) A white crystalline substance, C6H7(OH)5, found in acorns, the fruit of the oak (Quercus). It has a sweet taste, and is regarded as a pentacid alcohol., Quercitrin Quer"cit*rin, n. [Cf. F. quercitrin. See Quercitron.] (Chem.) A glucoside extracted from the bark of the oak (Quercus) as a bitter citron-yellow crystalline substance, used as a pigment and called quercitron., Quercus Quer"cus, n. [L., an oak.] (Bot.) A genus of trees constituted by the oak. See Oak.