Word.ws English Dictionary

oidium

oidium noun: a fragile spore produced by some fungi.

oidium: a fragile spore produced by some fungi
Image: CC BY-SA 3.0, via Wikimedia Commons

Noun

oidium (plural oidia)

  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.2003 August, Competition Science Vision, page 802
    • However, in some forms mainly some Hymenomycetes it occurs by the formation of oidia. The oidia are of two main types.2004, P.D. Sharma, The Fungi, page 241
  2. The fungus Erysiphe necator (= Uncinula necator), which produces powdery mildew in grapes.

Forms of oidium

pluraloidia

Origin of oidium

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

Questions about oidium

What does oidium mean?
Oidium means a fragile spore produced by some fungi.
What part of speech is oidium?
Oidium is a noun.
What is the plural of oidium?
The plural of oidium is oidia.

Words near oidium in the dictionary

  1. oidia
  2. oidial
  3. oidioid
  4. oidiomycosis
  5. oidiomycotic
  6. oidium
  7. OIDs
  8. OIF
  9. OIG
  10. oignon vert
  11. oignons verts

Source and license

Adapted from Wiktionary: oidium (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Cite this entry: “oidium.” Word.ws, https://word.ws/oidium. Based on Wiktionary, CC BY-SA 4.0.