castrum
The verdict
“castrum” is uncommon French (frequency #54,460 among 257,141 “C” headwords), classed as a noun. The kind of spelling people second-guess.
- #54,460
- frequency rank, French
- 257,141
- “C” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Forteresse, place forte, château-fort.
| Property | Value |
|---|---|
| Headword | castrum |
| Language | French |
| Part of speech | Noun |
| Letters | 7 |
| Frequency rank | #54,460 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “castrum” sits in French frequency
Rare enough to double-check
castrum is uncommon French at frequency #54,460 among 257,141 “C” headwords, classed as anoun. Rarity is why readers land here mid-draft. 3 senses are on record.
The misspelling generator found no plausible variants for castrum, since its letter pattern doesn't lend itself to common typo substitutions. This headword has no recorded confusable partner, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
This headword's origin isn't recorded in our source data, leaving phoneme-to-grapheme mapping as the best guide to its spelling rather than a borrowing history. The correct French form is castrum, spelled C-A-S-T-R-U-M.
Definition
- 1Forteresse, place forte, château-fort.
- 2Camp, campement. D’où étape (camp sur une route militaire).
- 3Vie dans les camps, service militaire.
Synonyms
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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Using “castrum”
The practical upshot for anyone who landed here from a spell-check.
- The one correct French spelling is C-A-S-T-R-U-M - every other letter order is a misspelling in standard orthography.
- Browse more French words and confusable pairs in the same reference. French words
Other uncommon French 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.