【化】 大黄根酸
【医】 大黄酸, 大黄酚

Chrysophanic \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.