n. A common hydrous aluminosilicate mineral found in sediments, soils and sedimentary rocks, Al2Si2O5(OH)4; one of the kaolin group of minerals.
The Century Dictionary and Cyclopedia
n. Kaolin in its crystalline form.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a mineral consisting of aluminum silicate; main source of kaolin
Word Usage
"There are, in fact, several distinct types of clay, the principal ones being: kaolinite, which is relatively stable, illite, which is of average stability, and montmorillonite, which is highly sensitive to water (causing swelling, etc)."