Definition of oidium in English:


Line breaks: oi¦dium
Pronunciation: /əʊˈɪdɪəm

noun (plural oidia /-dɪə/)

  • 1 Botany A type of fungal spore (conidium) formed by the breaking up of fungal hyphae into cells, especially as produced by powdery mildews.
  • 2 [mass noun] A fungal disease affecting vines, caused by a powdery mildew.
    • The fungus is Uncinula necator (formerly Oidium tuckeri), family Erysiphaceae, subdivision Ascomycotina
    More example sentences
    • The effects of phylloxera were first noted in France in 1863, just as the country was recovering from another great scourge of 19th century European viticulture: oidium, or powdery mildew, which was first noted in 1847.


mid 19th century: modern Latin, from Greek ōion 'egg' + the diminutive suffix -idion.

More definitions of oidium

Definition of oidium in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day mage
Pronunciation: māj
a magician or learned person