An absorbent aluminum silicate clay formed from volcanic ash and used in various adhesives, cements, and ceramic fillers.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "bentonite" in a sentence
"Bentonite is a primary montmorillonite clay mined in the U.S.A., but the term bentonite is often used for other commercial montmorillonite clays as well."
"Sodic bentonite is a type of clay that swells to many times its dry volume when wet."
"Second, there is an additive in that anthrax, bentonite, which is used to cause the anthrax to not stick together, and float in the air."