adj. pertaining to clay; made of, containing, or resembling clay
the GNU version of the Collaborative International Dictionary of English
adj. Of the nature of clay; consisting of, or containing, argil or clay; clayey.
The Century Dictionary and Cyclopedia
Of the nature of or resembling clay.
Containing a considerable amount of clayey matter: as, argillaceous earth.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. resembling or containing clay
Word Usage
"Hydraulic limestones, sometimes referred to as argillaceous limestones have a high proportion of clay and silicia (15-20 %) and can be either high calcium or magnesian."