Main Entry: oid·ium

Pronunciation: \ō-ˈid-ē-əm\

Function: noun

1 capitalized : a genus of imperfect fungi of the family Moniliaceae including many which are now considered to be conidial stages of various powdery mildews
2 plural oid·ia \-ē-ə\ : any fungus of the genus Oidium
3 plural oidia : arthroconidium