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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urobilin in Medicine


[yur′ō-bīlĭn, -bĭlĭn]


A pigment in urine that produces an orange-red color whose intensity varies with its degree of oxidation.
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