claustrum
/ˈklɔːstɹəm/noun
claustrum is spelled C-L-A-U-S-T-R-U-M: 9 letters. It appears about once in every 48 million words in written English, the 214,628th most frequent word form (wordfreq, 2021 data). As a noun, claustrum means “A thin, irregular sheet of grey matter underneath the inner part of the neocortex on both sides of the brains of mammals; its exact function is not…” (English Wiktionary, September 2026). The plural of claustrum is claustra.
How many letters and syllables are in claustrum?
| Letters | 9: C-L-A-U-S-T-R-U-M |
|---|---|
| In writing | about once in every 48 million words; the 214,628th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is claustrum?
Claustrum appears about once in every 48 million words in written English, the 214,628th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce claustrum?
- UK /ˈklɔːstɹəm/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of claustrum
- claustra plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does claustrum mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A thin, irregular sheet of grey matter underneath the inner part of the neocortex on both sides of the brains of mammals; its exact function is not understood, but it is believed to facilitate coordination between senses
For quotations using this term, see Citations:claustrum.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Claustrum in Spanish, French, German and Portuguese
In the sense sheet of grey matter:
| Language | Words |
|---|---|
| German | Vormauer, Claustrum |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does claustrum come from?
Unadapted borrowing from Latin claustrum (“a bolt, bar”). Doublet of cloister.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).