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From: Webster's Revised Unabridged Dictionary (1913)

 Chrys·o·phan·ic a. Pertaining to, or derived from, or resembling, chrysophane.
 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.
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