bentonite
bentonite[ˈbɛntənʌɪt]noun- [mass noun]a kind of absorbent clay formed by breakdown of volcanic ash, used especially as a filler
膨润土,皂土,斑脱土(由火山灰分解而形成的一种黏土,吸水性强,尤用作填料)
语源- late 19th cent.: from the name of Fort Benton in Montana, US, where it is found , + -ite
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