oidium
noun
oidium is spelled O-I-D-I-U-M: 6 letters. It appears about once in every 79 million words in written English, the 282,993rd most frequent word form (wordfreq, 2021 data). As a noun, oidium means “A fragile spore produced by some fungi” (English Wiktionary, September 2026). The plural of oidium is oidia.
How many letters and syllables are in oidium?
| Letters | 6: O-I-D-I-U-M |
|---|---|
| In writing | about once in every 79 million words; the 282,993rd most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is oidium?
Oidium appears about once in every 79 million words in written English, the 282,993rd most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Forms of oidium
- oidia plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does oidium mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A fragile spore produced by some fungi.
- 2
The fungus Erysiphe necator (= Uncinula necator), which produces powdery mildew in grapes.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Oidium in Spanish, French, German and Portuguese
In the sense cognate translations of oidium – otherwise see powdery mildew:
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does oidium come from?
From New Latin ōidium, equivalent to Ancient Greek ᾠόν (ōión, “egg”) + -idium.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).