Definition of bentonite in English:


Syllabification: ben·ton·ite
Pronunciation: /ˈbentnˌīt


  • A kind of absorbent clay formed by the breakdown of volcanic ash, used especially as a filler.
    More example sentences
    • Sedimentary rocks such as mudstones often contain a variety of clay minerals, including swelling clays such as bentonite.
    • I work with a low-fire clay body consisting of ball clay, talc and bentonite.
    • Three types of soils, residual soils, kaolinite and bentonite, were used in the study.


late 19th century: from the name of Fort Benton in Montana, where it is found, + -ite1.

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