ベントナイトベントナイトMeanings1nounbentoniteA type of absorbent clay formed from volcanic ash, used in drilling mud, binder, and sealant. Technical term.ベントナイトは土ど木ぼく工こう事じで遮しゃ水すい材ざいとして使つかわれる。Bentonite is used as a waterproofing material in civil engineering works.
