n.
An absorbent aluminum silicate clay formed from volcanic ash and used in various adhesives, cements, and ceramic fillers.
[After Benton Formation (formerly Fort Benton Formation) of the Rock Creek district in eastern Wyoming.]
bentonitic ben'ton·it'ic (-nĭt'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
