Source : Webster's Revised Unabridged Dictionary (1913)

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.