oidium

The English word “oidium” has 2 meanings listed here.

noun

A fragile spore produced by some fungi.
The fungus Erysiphe necator (= Uncinula necator), which produces powdery mildew in grapes.

From New Latin ōidium, equivalent to Ancient Greek ᾠόν (ōión, “egg”) + -idium.

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