chrysophanic

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CIDE DICTIONARY

chrysophanic, a.

Pertaining to, or derived from, or resembling, chrysophane. [1913 Webster]

Chrysophanic acid (Chem.), a yellow crystalline substance extracted from rhubarb, yellow dock, sienna, chrysarobin, etc., and shown to be a derivative of an anthracene. It is used in the treatment of skin diseases; -- called also rhein, rheic acid, rhubarbarin, etc.