Type: Term Pronunciation: bil′i-rū′bin-oyd Definitions: 1. Generic term denoting intermediates in the conversion of bilirubin to stercobilin by reductive enzymes in intestinal bacteria. Included are mesobilirubin, mesobilane, mesobilene-b, urobilinogen, urobilin, reduction products of mesobilane (stercobilinogen) and mesobilene (st...