bentonite

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ben·ton·ite

 (bĕn′tə-nīt′)
n.
An absorbent aluminum silicate clay formed from volcanic ash and used in various adhesives, cements, and ceramic fillers.

[After Benton Formation of the Rock Creek district in eastern Wyoming.]

ben′ton·it′ic (-nĭt′ĭk) adj.

bentonite

(ˈbɛntəˌnaɪt)
n
(Geological Science) 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
[C19: from Fort Benton, Montana, USA, where found, + -ite1]

ben•ton•ite

(ˈbɛn tnˌaɪt)

n.
a porous clay that swells to several times its dry volume when absorbing water.
[1895–1900; after Fort Benton, Montana]
ben•ton•it•ic (ˌbɛn tnˈɪt ɪk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.bentonite - an absorbent aluminum silicate clay formed from volcanic ash
clay - a very fine-grained soil that is plastic when moist but hard when fired