peritoneum
/ˌpɛ.ɹɪ.təˈniː.əm/
"peritoneum" is a 10-letter English headword indexed on PlainSpell.
The verdict
“peritoneum” is uncommon English (frequency #81,693 among 4,417 “P” headwords), classed as a noun. The kind of spelling people second-guess.
- #81,693
- frequency rank, English
- 4,417
- “P” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - In mammals, the serous membrane lining the cavity of the abdomen and that is folded over the viscera.
Corpus desk
Index EN-peritoneum · peritoneum · English
peritoneum · rank #81,693 · 0 variants · 0 confusables
- FREQ-RARE #81,693
- LEN-MEGA 10 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 4,417
- PHOTO-FINISH perineal
Nearest frequency peer: perineal (-1 rank slots)
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.
Long-tail ranks near “peritoneum”
Sparse band: bars invert rank so rarer forms read shorter
- penitential
penitential
18,311 corpus weight
- perineal
perineal
18,309 corpus weight
- peritoneum
peritoneum
18,308 corpus weight
- phablet
phablet
18,306 corpus weight
- pharos
pharos
18,305 corpus weight
- PHB
PHB
18,304 corpus weight
What this shows Long-tail view: where “peritoneum” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | peritoneum |
| Language | English |
| Part of speech | Noun |
| IPA | /ˌpɛ.ɹɪ.təˈniː.əm/ |
| Letters | 10 |
| Frequency rank | #81,693 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “peritoneum” in English
Rare enough to double-check
peritoneum is uncommon English at frequency #81,693 among 4,417 “P” headwords, classed as anoun, transcribed /ˌpɛ.ɹɪ.təˈniː.əm/. Rarity is why readers land here mid-draft. 2 senses are on record.
peritoneum doesn't appear in our generated misspelling index, a straightforward case of a spelling with little room for common typos. This entry stands alone in our confusable dataset, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: From Latin peritonaeum, from Ancient Greek περιτόναιον (peritónaion), from περιτόναιος (peritónaios, “stretched or strained over”). The correct English form is peritoneum, spelled P-E-R-I-T-O-N-E-U-M.
Definition
- 1In mammals, the serous membrane lining the cavity of the abdomen and that is folded over the viscera.
- 2In animals, the membrane lining the coelom cavity.
Etymology
From Latin peritonaeum, from Ancient Greek περιτόναιον (peritónaion), from περιτόναιος (peritónaios, “stretched or strained over”).
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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Similar English words by spelling shape
Same letter count and similar misspelling depth for "peritoneum", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 10 letters (nearest by frequency rank).