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bentonite

[ben-tn-ahyt] /ˈbɛn tnˌaɪt/
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
1895-1900
1895-1900; named after Fort Benton, Montana; see -ite1
Related forms
bentonitic
[ben-tn-it-ik] /ˌbɛn tnˈɪt ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for bentonitic

bentonite

/ˈbɛntəˌnaɪt/
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
C19: from Fort Benton, Montana, USA, where found, + -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for bentonitic

bentonite

clay formed by the alteration of minute glass particles derived from volcanic ash. It was named for Fort Benton, Mont., near which it was discovered

Learn more about bentonite with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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