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tuff

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tuff

Main Entry:: tuff
Pronunciation:: \ˈtəf\
Function:: noun
Etymology:: earlier tuph, tuft porous rock, from Middle French tuf, from Old Italian tufo
Date:: 1815

: a rock composed of the finer kinds of volcanic detritus usually fused together by heat

— tuff·a·ceous

Listen to the pronunciation of tuffaceous

\ˌtə-ˈfā-shəs\ adjective

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