Breadcrumb Home > Dictionary > Index B bentonite: Meaning and Definition of Find definitions for: ben•ton•ite Pronunciation: (ben'tn īt"), [key] — n. Mineral. a clay formed by the decomposition of volcanic ash, having the ability to absorb large quantities of water and to expand to several times its normal volume. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bentonite (Thesaurus) Benton Harbor bentwood TrendingHere are the facts and trivia that people are buzzing about. Hard Labor Current Events This Week: June 2023 Languages Spoken in Each Country of the World User's Guide to Environmental Language The Washington Monument: Facts, History & Profile LGBT Pride Month | Biographies of Notable Individuals Civilian Labor Force ✖ Related Content Daily Word Quiz: poetaster Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language