What is "rheic"

Rheic \Rhe"ic\, a. [NL. Rheum rhubarb, Gr. ??? See Rhubarb.] (Chem.) Pertaining to, or designating, an acid (commonly called chrysophanic acid) found in rhubarb ( Rheum). [Obsoles.]

Rheic may refer to:

• Rheic Ocean, a Paleozoic ocean between the large continent Gondwana to the south and the microcontinents Avalonia and others
• Rheic acid, a synonym for the molecule rhein