- Geology, Petrology. of the nature of or resembling clay; clayey.
- containing a considerable amount of clayey matter.
Origin of argillaceous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for argillaceous
It must also not be full of argillaceous and iron-oxide infillings.
Argillaceous rocks, composed essentially of particles of mud.
From clay and chalk, or argillaceous river-mud and chalk or limestone, calcined together, and then ground to powder.
Argillaceous or marly limestone is also of common occurrence.
It alternates with both these rocks, and in like manner with argillaceous schist.
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