bentonite

[ben-tn-ahyt]
noun Mineralogy.
  1. a clay formed by the decomposition of volcanic ash, having the ability to absorb large quantities of water and to expand to several times its normal volume.

Origin of bentonite

1895–1900; named after Fort Benton, Montana; see -ite1
Related formsben·ton·it·ic [ben-tn-it-ik] /ˌbɛn tnˈɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for bentonite

Historical Examples of bentonite

  • Sodium sulphate and bentonite are two of the more recent mineral discoveries in North Dakota.


British Dictionary definitions for bentonite

bentonite

noun
  1. a valuable clay, formed by the decomposition of volcanic ash, that swells as it absorbs water: used as a filler in the building, paper, and pharmaceutical industries

Word Origin for bentonite

C19: from Fort Benton, Montana, USA, where found, + -ite 1
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