Hypertext Webster Gateway: "uroerythrin"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Uroerythrin \U`ro*e*ryth"rin\, n. [See 1st {Uro-}, and
{Erythrin}.] (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.
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