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Medical Definition of Xanthurenic acid
1. 4,8-Dihydroxyquinoline-2-carboxylic acid; 4,8-dihydroquinaldic acid;the sulfur-yellow crystals form a red compound with Millon reagent, or an intensely green one with ferrous sulfate; excreted in the urine of pyridoxine-deficient animals after the ingestion of tryptophan, and of rats fed almost exclusively with fibrin. (05 Mar 2000)