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bentonite Line breaks: ben¦ton|ite
Pronunciation: /ˈbɛntənʌɪt/

Definition of bentonite in English:


[mass noun]
A kind of absorbent clay formed by breakdown of volcanic ash, used especially as a filler.
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, US, where it is found, + -ite1.

Definition of bentonite in:
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