oidium

noun

oid·​i·​um ō-ˈi-dē-əm 

plural oidia ō-ˈi-dē-ə 

1

a

: any of a genus (Oidium of the family Moniliaceae) of imperfect fungi many of which are now considered to be conidial stages of various powdery mildews

b

: one of the small conidia borne in chains by various fungi (such as an oidium)

called also arthrospore

2

: a powdery mildew especially of grapes caused by an oidium

Word History

Etymology

New Latin, from o- + -idium

First Known Use

1888, in the meaning defined at sense 1a

Medical Definition

oidium

noun

oid·​ium ō-ˈid-ē-əm 

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 oidia -ē-ə  : any fungus of the genus Oidium

3

plural oidia : arthroconidium