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Bentonite

noun

Definitions

Noun
  1. 1
    Any of several impure clay minerals consisting mostly of montmorillonite. countable, uncountable
  2. 2
    an absorbent aluminum silicate clay formed from volcanic ash wordnet
  3. 3
    A porous clay formed by the decomposition of volcanic ash that swells 5 to 6 times its original volume in the presence of water. countable, uncountable

Etymology

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

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