Search Result for "bentonite": 
Wordnet 3.0

NOUN (1)

1. an absorbent aluminum silicate clay formed from volcanic ash; 



The Collaborative International Dictionary of English v.0.48:

bentonite \bentonite\ n.
   an absorbent aluminum silicate clay formed from volcanic ash.
   [WordNet 1.5]


WordNet (r) 3.0 (2006):

bentonite
    n 1: an absorbent aluminum silicate clay formed from volcanic
         ash