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From The Collaborative International Dictionary of English v.0.48:
Violuric \Vi`o*lu"ric\, a. [Violet + barbituric.] (Chem.) Of, pertaining to, or designating, a complex nitroso derivative of barbituric acid. It is obtained as a white or yellow crystalline substance, and forms characteristic yellow, blue, and violet salts. [1913 Webster]