endothelium
"endothelium" is a 11-letter English headword indexed on PlainSpell.
The verdict
“endothelium” is uncommon English (frequency #68,192 among 18,836 “E” headwords), classed as a noun. The kind of spelling people second-guess.
- #68,192
- frequency rank, English
- 18,836
- “E” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A thin layer of flat epithelial cells that lines the heart, serous cavities, lymph vessels, and blood vessels.
Corpus desk
Index EN-endothelium · endothelium · English
endothelium · rank #68,192 · 0 variants · 0 confusables
- FREQ-RARE #68,192
- LEN-MEGA 11 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 18,836
- PHOTO-FINISH Enola
Nearest frequency peer: Enola (+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.
Frequency neighbourhood for “endothelium”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- elytra
elytra
31,815 corpus weight
- empath
empath
31,811 corpus weight
- endothelium
endothelium
31,809 corpus weight
- Enola
Enola
31,808 corpus weight
- ensnare
ensnare
31,806 corpus weight
- ergodic
ergodic
31,805 corpus weight
What this shows Bars show where “endothelium” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | endothelium |
| Language | English |
| Part of speech | Noun |
| Letters | 11 |
| Frequency rank | #68,192 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “endothelium” sits in English frequency
Rare enough to double-check
endothelium is uncommon English at frequency #68,192 among 18,836 “E” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A thin layer of flat epithelial cells that lines the heart, serous cavities, lymph vessels, and blood vessels.".
Zero misspellings are on record for endothelium in our index, suggesting the orthography follows predictable English patterns. Our confusable-pair dataset has no match for it, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: From endo- + -thelium, as in epithelium. The correct English form is endothelium, spelled E-N-D-O-T-H-E-L-I-U-M.
Definition
- 1A thin layer of flat epithelial cells that lines the heart, serous cavities, lymph vessels, and blood vessels.
Etymology
From endo- + -thelium, as in epithelium.
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.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 6, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
Frequently Asked Questions
How do you spell "endothelium"?
What does "endothelium" mean?
What is the origin of the word "endothelium"?
Is PlainSpell free to use?
Similar English words by spelling shape
Same letter count and similar misspelling depth for "endothelium", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 11 letters (nearest by frequency 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.