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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 of argillaceous
1725-1735
First recorded in 1725-35, argillaceous is from the Latin word argillāceus clayish. See argil, -aceous
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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