oidium
oid·i·um
noun \ō-ˈi-dē-əm\ plural -ia \-dē-ə\
Definition of OIDIUM
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 (as an oidium) —called also arthrospore
2
: a powdery mildew especially of grapes caused by an oidium
Origin of OIDIUM
New Latin, from o- + -idium
First Known Use: 1857
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