noun \ˈtəf\

Definition of TUFF

:  a rock composed of the finer kinds of volcanic detritus usually fused together by heat
tuff·a·ceous \ˌtə-ˈfā-shəs\ adjective

Origin of TUFF

earlier tuph, tuft porous rock, from Middle French tuf, from Old Italian tufo
First Known Use: 1815

Other Geology Terms

anthracite, boulder, cwm, erratic, igneous, intrusive, mesa, sedimentary, silt, swale


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