\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.