octane
\ɔk.tan\
The verdict
“octane” is uncommon French (frequency #66,955 among 1,642 “O” headwords), classed as a noun. The kind of spelling people second-guess.
- #66,955
- frequency rank, French
- 1,642
- “O” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Hydrocarbure saturé de la famille des paraffines, aux nombreux isomères. Sa formule chimique est C₈H₁₈.
Corpus desk
Index FR-octane · octane · French
octane · rank #66,955 · 0 variants · 0 confusables
- FREQ-RARE #66,955
- LEN-LONG 6 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 1,642
- PHOTO-FINISH obéissait
Nearest frequency peer: obéissait (-1 rank slots)
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.
Rangs de longue queue près de « octane »
Bande clairsemée: les barres inversent le rang pour que le rare se lise plus court
- NVA
NVA
33,049 corpus weight
- oblats
oblats
33,048 corpus weight
- obéissait
obéissait
33,047 corpus weight
- octane
octane
33,046 corpus weight
- Odet
Odet
33,045 corpus weight
- Odoxa
Odoxa
33,044 corpus weight
What this shows Vue de longue queue: où « octane » se situe face à des rangs français aussi rares.
| Property | Value |
|---|---|
| Headword | octane |
| Language | French |
| Part of speech | Noun |
| IPA | \ɔk.tan\ |
| Letters | 6 |
| Frequency rank | #66,955 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Longue queue: rang de « octane » en français
Rare enough to double-check
octane is uncommon French at frequency #66,955 among 1,642 “O” headwords, classed as anoun, transcribed \ɔk.tan\. Rarity is why readers land here mid-draft. Gloss: "Hydrocarbure saturé de la famille des paraffines, aux nombreux isomères. Sa formule chimique est C₈H₁₈.".
The misspelling generator found no plausible variants for octane, which points to an orthography that plays by predictable French rules. This headword has no recorded confusable partner, since no other headword is close enough in sound or shape to pair with it.
Our source data has no etymology on file for this entry, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct French form is octane, spelled O-C-T-A-N-E.
Definition
- 1Hydrocarbure saturé de la famille des paraffines, aux nombreux isomères. Sa formule chimique est C₈H₁₈.
Recorded use
Wiktionary exampleThese source excerpts show how octane appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Indice d’octane : Indication du pouvoir antidétonant d’un carburant, mesuré par comparaison avec un mélange de l’iso-octane 2,2,4-triméthylpentane et de n-heptane. Un indice d’octane de 87 signifie que l’essence a le même pouvoir antidétonant qu’un mélange de 87% d’octane et de 13% d’heptane (par volume).
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 French corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Similar French words by spelling shape
Same letter count and similar misspelling depth for "octane", not the corpus desk frequency band.
Same letter count
Frequency-ranked French headwords with 6 letters (nearest by frequency rank).