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The Adobe Flash Player is required in order to view this content. You can get it here: tuffOne entry found. 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 \ˌtə-ˈfā-shəs\ adjective 
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