dioxygen
/daɪˈɒksɪdʒən/
"dioxygen" is a 8-letter English headword indexed on PlainSpell.
The verdict
“dioxygen” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 8
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Diatomic oxygen: the normal allotrope of oxygen, having two atoms per molecule.
| Property | Value |
|---|---|
| Headword | dioxygen |
| Language | English |
| Part of speech | Noun |
| IPA | /daɪˈɒksɪdʒən/ |
| Letters | 8 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “dioxygen” sits in English frequency
Rare enough to double-check
dioxygen is uncommon English outside the top frequency list, classed as anoun, transcribed /daɪˈɒksɪdʒən/. Rarity is why readers land here mid-draft. 2 senses are on record.
dioxygen has no tracked misspelling variants, suggesting the orthography follows predictable English patterns. This entry stands alone in our confusable dataset, since its spelling is unusual enough that it doesn't cluster with a lookalike.
Etymologically, the entry records: From di- + oxygen. The correct English form is dioxygen, spelled D-I-O-X-Y-G-E-N.
Definition
- 1Diatomic oxygen: the normal allotrope of oxygen, having two atoms per molecule.
- 2Two atoms of oxygen in a molecule.
Etymology
From di- + oxygen.
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “dioxygen”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is D-I-O-X-Y-G-E-N - every other letter order is a misspelling in standard orthography.
- Say it as /daɪˈɒksɪdʒən/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.