urobilin

from WordNet (r) 3.0 (2006)

urobilin
    n 1: brown bile pigment formed from urobilinogens and found in
         feces and in small amounts in urine

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]