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urobilin

From The Collaborative International Dictionary of English v.0.48:

Urobilin \U`ro*bi"lin\, n. [1st uro- + bile + -in.] (Physiol.
   Chem.)
   A yellow pigment identical with hydrobilirubin, abundant in
   the highly colored urine of fever, and also present in normal
   urine. See Urochrome.
   [1913 Webster]

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