dihydrogen monoxide
/daɪˈhaɪdɹədʒ(ə)n məˈnɒksaɪd/
"dihydrogen-monoxide" is a 18-letter English headword indexed on PlainSpell.
The verdict
“dihydrogen monoxide” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 19
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - H₂O, water.
Corpus desk
Index EN-dihydrogen-monoxide · dihydrogen monoxide · English
dihydrogen monoxide · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 19 letters
- VOW-8 8 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "D" thin
- PHOTO-UNK Peer pending
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
| Property | Value |
|---|---|
| Headword | dihydrogen monoxide |
| Language | English |
| Part of speech | Noun |
| IPA | /daɪˈhaɪdɹədʒ(ə)n məˈnɒksaɪd/ |
| Letters | 19 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “dihydrogen monoxide” in English
Rare enough to double-check
dihydrogen monoxide is uncommon English outside the top frequency list, classed as anoun, transcribed /daɪˈhaɪdɹədʒ(ə)n məˈnɒksaɪd/. Rarity is why readers land here mid-draft. Gloss: "H₂O, water.".
We couldn't generate a plausible misspelling set for dihydrogen monoxide, and the word's spelling is regular enough that our generator found nothing worth flagging. This entry stands alone in our confusable dataset, which tends to mean the word is visually distinctive enough to stand on its own.
No documented word history exists for this headword, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is dihydrogen monoxide, spelled D-I-H-Y-D-R-O-G-E-N- -M-O-N-O-X-I-D-E.
Definition
- 1H₂O, water.
Recorded use
Wiktionary examplesThese source excerpts show how dihydrogen monoxide appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Thus ice contracts when melting, ice being a regular and rather open structure of hydrogen and oxygen atoms, while water is a collection of dihydrogen-monoxide (H₂O), tetra-hydrogen dioxide (2H₂O), and more complex molecules.
The Invisible Killer Dihydrogen monoxide is colorless, odorless, tasteless, and kills uncounted thousands of people every year. Most of these deaths are caused by accidental inhalation of DHMO, but the dangers of dihydrogen monoxide do not end there.
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.