Bentonite Definition

bĕntə-nīt
noun
An absorbent aluminum silicate clay formed from volcanic ash and used in various adhesives, cements, and ceramic fillers.
American Heritage
A porous clay consisting mainly of the mineral montmorillonite, which swells greatly when it absorbs water.
Webster's New World

(mineralogy) Any of several impure clay minerals consisting mostly of montmorillonite.

Wiktionary

A porous clay formed by the decomposition of volcanic ash that swells 5 to 6 times its original volume in the presence of water.

Wiktionary
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Other Word Forms of Bentonite

Noun

Singular:
bentonite
Plural:
bentonites

Origin of Bentonite

  • After Benton Formation of the Rock Creek district in eastern Wyoming

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Benton +‎ -ite, after the place it was first mined: Fort Benton, Montana.

    From Wiktionary

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