n. [ L. bilis biel + ruber red. ] (Physiol.) A reddish yellow pigment present in human bile, and in that from carnivorous and herbivorous animals; the normal biliary pigment. [ 1913 Webster ]
n. [ Hydro-, 2 + bilirubin. ] (Physiol. Chem.) A body formed from bilirubin, identical with urobilin. [ 1913 Webster ]