furunculosis Syllabification: (fu·run·cu·lo·sis)Pronunciation: /fyo͝oˌrəNGkyəˈlōsəs/Definition of furunculosis noun 1 Medicine the simultaneous or repeated occurrence of boils on the skin. 2a bacterial disease of salmon and trout. Origin: late 19th century: from furuncle + -osisfurunculosis in other Oxford dictionaries Definition of furunculosis in the British & World English dictionary