fibrillation
/ˌfɪbɹɪˈleɪʃən/
"fibrillation" is a 12-letter English headword indexed on PlainSpell.
The verdict
“fibrillation” has 17 generated spelling variants in the English index at frequency #36,142. The variants make it a useful spelling check.
- #36,142
- frequency rank, English
- 18,613
- “F” headwords
- 17
- tracked misspellings
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The rapid, irregular, and unsynchronized contraction of the muscle fibers of the heart.
| Property | Value |
|---|---|
| Headword | fibrillation |
| Language | English |
| Part of speech | Noun |
| IPA | /ˌfɪbɹɪˈleɪʃən/ |
| Letters | 12 |
| Frequency rank | #36,142 |
| Misspellings tracked | 17 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “fibrillation” sits in English frequency
A misspelling magnet
The generator records 17 spelling variants around fibrillation (IPA /ˌfɪbɹɪˈleɪʃən/), anoun. Corpus frequency is #36,142 among 18,613 “F” headwords. Dominant gloss: "The rapid, irregular, and unsynchronized contraction of the muscle fibers of the heart.".
Our generated misspelling index lists 17 likely wrong-spelling variants for fibrillation, with forms such as "fbirillation", "ffibrillation", and "fibbrillation". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. This headword has no recorded confusable partner, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: From fibrilla + -ation. The correct English form is fibrillation, spelled F-I-B-R-I-L-L-A-T-I-O-N.
Definition
- 1The rapid, irregular, and unsynchronized contraction of the muscle fibers of the heart.
Etymology
From fibrilla + -ation.
This word in other languages
Common misspellings
Also misspelled as:
- fbirillation
- ffibrillation
- fibbrillation
- fibirllation
- fibrilaltion
- fibrilation
- fibrillaiton
- fibrillasion
- fibrillatino
- fibrillationn
- fibrillatoin
- fibrillattion
- fibrilltaion
- fibrlilation
- fibrrillation
- firbillation
- ifbrillation
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of fibrillation - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
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
How do you spell "fibrillation"?
What does "fibrillation" mean?
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Is PlainSpell free to use?
Using “fibrillation”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is F-I-B-R-I-L-L-A-T-I-O-N - every other letter order is a misspelling in standard orthography.
- Say it as /ˌfɪbɹɪˈleɪʃən/ (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
Same frequency band
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.