bentonite.
Any of several impure clay minerals consisting mostly of montmorillonite.
Meaning & usage
Any of several impure clay minerals consisting mostly of montmorillonite.
A porous clay formed by the decomposition of volcanic ash that swells 5 to 6 times its original volume in the presence of water.
Where this word comes from
From Benton + -ite, after the place where it was first mined: Fort Benton, Montana.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.