n. [ L. bilis bile + fuscus dark. ] (Physiol.) A brownish green pigment found in human gallstones and in old bile. It is a derivative of bilirubin. [ 1913 Webster ]
n. [ L. fuscus dark-colored, tawny. ] (Physiol. Chem.) A brown, nitrogenous pigment contained in the retinal epithelium; a variety of melanin. [ 1913 Webster ]
n. (Chem.) A dark-colored substance obtained from empyreumatic animal oil. [ R. ] [ 1913 Webster ]
n. [ Indican + L. fuscus dusky. ] (Chem.) A brown amorphous powder, obtained from indican. [ 1913 Webster ]