montmorillonite
noun
montmorillonite is a noun meaning “Any of a group of soft, clay-like silicate minerals having many industrial and technical uses” (English Wiktionary, September 2026). It is spelled M-O-N-T-M-O-R-I-L-L-O-N-I-T-E, and it appears about once in every 21 million words in written English (wordfreq, 2021 data). The plural of montmorillonite is montmorillonites.
What does montmorillonite mean?
noun
- 1
Any of a group of soft, clay-like silicate minerals having many industrial and technical uses.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of montmorillonite
- montmorillonites plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is montmorillonite?
Montmorillonite appears about once in every 21 million words in written English, the 138,319th 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).
Montmorillonite in Spanish, French, German and Portuguese
In the sense a type of smectite clay:
| Language | Words |
|---|---|
| French | montmorillonite |
| German | Montmorillonit |
| Portuguese | montmorilonite |
| Spanish | montmorillonita |
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 montmorillonite come from?
From Montmorillon + -ite, after where it was identified.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).