mycosis Syllabification: (my·co·sis)Pronunciation: /mīˈkōsəs/Definition of mycosis noun (plural mycoses /-sēz/) a disease caused by infection with a fungus, such as ringworm or thrush. Derivatives mycoticPronunciation: /-ˈkätik/ adjective mycosis in other Oxford dictionaries Definition of mycosis in the British & World English dictionary