• (n.) A brownish green pigment found in human gallstones and in old bile. It is a derivative of bilirubin.
Bil`i·fus'cin noun [ Latin bilis bile + fuscus dark.] (Physiol.) A brownish green pigment found in human gallstones and in old bile. It is a derivative of bilirubin. 
bilifuscin A bile pigment (coloring) found in bile and gallstones.