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单词 bentonite
释义 bentonite
 —bentonitic /ben'tn it"ik/,  adj.  
 /ben"tn uyt'/, 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.
 [1895-1900; named after Fort Benton, Montana; see -ITE1]
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