Home › Words › P › probilifuscinprobilifuscinprobilifuscin · noun — any of a class of structurally indefinite bilirubinoid compounds found in gallstones, often associated with pathologic conditions like jaundice or liver disease.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom pro- + bili- + fusc(us) + -in.nounAny of a class of structurally indefinite bilirubinoid compounds found in gallstones, often associated with pathologic conditions like jaundice or liver disease.Definitions & examples from Wiktionary (CC BY-SA 3.0).