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n.1.(Physiol. Chem.) A reddish urinary pigment, considered as the substance which gives to the urine of rheumatism its characteristic color. It also causes the red color often seen in deposits of urates.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The typical yellow-amber color is caused by urochrome and, to a lesser extent, uroerythrin or urobilin.