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tuff

One entry found for tuff.
Main Entry: tuff
Pronunciation: 't&f
Function: noun
Etymology: earlier tuph, tuft porous rock, from Middle French tuf, from Old Italian tufo
: a rock composed of the finer kinds of volcanic detritus usually fused together by heat
- tuff·a·ceous /"t&-'fA-sh&s/ adjective
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