urobilin

/ ˌjʊərəʊˈbaɪlɪn /

noun

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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“Urobilinogen then spontaneously degrades into a molecule called urobilin, which is responsible for the yellow color we are all familiar with.”