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smectite

[smek-tahyt]
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noun Mineralogy.
  1. montmorillonite.
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Origin of smectite

1805–15; < Greek smēkt(ós) smeared + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for smectite

smectite

noun
  1. any of a group of clay minerals of which montmorillonite and saponite are members
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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