Quer″cit‐rin (–sĭ‐trĭn), 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.