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From The Collaborative International Dictionary of English v.0.48:
Xanthorhamnin \Xan`tho*rham"nin\, n. [Xantho- + NL. Rhamnus, the generic name of the plant bearing Persian berries.] (Chem.) A glucoside extracted from Persian berries as a yellow crystalline powder, used as a dyestuff. [1913 Webster]