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argillaceous

[ahr-juh-ley-shuh s] /ˌɑr dʒəˈleɪ ʃəs/
adjective
1.
Geology, Petrology. of the nature of or resembling clay; clayey.
2.
containing a considerable amount of clayey matter.
Origin
1725-1735
1725-35; < Latin argillāceus clayish. See argil, -aceous
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for argillaceous

argillaceous

/ˌɑːdʒɪˈleɪʃəs/
adjective
1.
(of sedimentary rocks and deposits) composed of very fine-grained material, such as clay, shale, etc Compare arenaceous (sense 1), rudaceous
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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