hydrazine
/ˈhaɪdɹəˌziːn/
"hydrazine" is a 9-letter English headword indexed on PlainSpell.
The verdict
“hydrazine” is uncommon English (frequency #70,760 among 23,837 “H” headwords), classed as a noun. The kind of spelling people second-guess.
- #70,760
- frequency rank, English
- 23,837
- “H” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A corrosive, fuming liquid, NH₂-NH₂, used as a rocket fuel.
| Property | Value |
|---|---|
| Headword | hydrazine |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈhaɪdɹəˌziːn/ |
| Letters | 9 |
| Frequency rank | #70,760 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “hydrazine” sits in English frequency
Rare enough to double-check
hydrazine is uncommon English at frequency #70,760 among 23,837 “H” headwords, classed as anoun, transcribed /ˈhaɪdɹəˌziːn/. Rarity is why readers land here mid-draft. 2 senses are on record.
We couldn't generate a plausible misspelling set for hydrazine, since its letter pattern doesn't lend itself to common typo substitutions. Our confusable-pair dataset has no match for it, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: Borrowed from German Hydrazin, coined by Emile Fischer in 1875 as a derivative from Diazin, an obsolete name for diimide, of which hydrazine is a hydrogenated analog. By surface analysis, hydr- + azo (“nitrogen”) + -ine. The correct English form is hydrazine, spelled H-Y-D-R-A-Z-I-N-E.
Definition
- 1A corrosive, fuming liquid, NH₂-NH₂, used as a rocket fuel.
- 2Any member of the class of organic compounds formally derived from NH₂-NH₂.
Etymology
Borrowed from German Hydrazin, coined by Emile Fischer in 1875 as a derivative from Diazin, an obsolete name for diimide, of which hydrazine is a hydrogenated analog. By surface analysis, hydr- + azo (“nitrogen”) + -ine.
Synonyms
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); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “hydrazine”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is H-Y-D-R-A-Z-I-N-E - every other letter order is a misspelling in standard orthography.
- Say it as /ˈhaɪdɹəˌziːn/ (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
Other uncommon English words near this rank
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.