Definition of Coniothyrium
: a form genus of imperfect fungi (family Sphaeropsidaceae) with dark olivaceous spores that includes a species (C. diplodiella) that causes white rot of grapes
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Origin and Etymology of coniothyrium
New Latin, from 2coni- + thyr- (from Greek thyreos oblong shield, from thyra door) + -ium
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