Oidium

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A fragile spore produced by some fungi.

    "• Oidia are hyaline, small and thin-walled unicellular sections or fragments of the mycelium. • Oidia may be uni- or binucleate as whether they are produced by the breaking up of the primary or secondary mycelium."

  2. 2
    The fungus Erysiphe necator (= Uncinula necator), which produces powdery mildew in grapes.

Synonyms

All synonyms
conidium

Example

More examples

"• Oidia are hyaline, small and thin-walled unicellular sections or fragments of the mycelium. • Oidia may be uni- or binucleate as whether they are produced by the breaking up of the primary or secondary mycelium."

Etymology

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

Related phrases

powdery mildew

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.