What is "rhodizonic"

Rhodizonic \Rho`di*zon"ic\, a. [Gr. ??? to be rose-red.] (Chem.) Pertaining to, or designating, a colorless crystalline substance (called rhodizonic acid, and carboxylic acid) obtained from potassium carboxide and from certain quinones. It forms brilliant red, yellow, and purple salts.