urobilin

World English Dictionary
urobilin (ˌjʊərəʊˈbaɪlɪn)
 
n
a brownish pigment found in faeces and sometimes in urine. It is formed by oxidation of urobilinogen, a colourless substance produced by bacterial degradation of the bile pigment bilirubin in the intestine

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American Heritage
Medical Dictionary

urobilin u·ro·bi·lin (yur'ō-bī'lĭn, -bĭl'ĭn)
n.
A pigment in urine that produces an orange-red color whose intensity varies with its degree of oxidation.

The American Heritage® Stedman's Medical Dictionary
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