a porous igneous rock, usually stratified, formed by consolidation of volcanic ash, dust, etc.
Origin of tuffFrench tuf, earlier tufe, tuffe ; from Italian tufo, tufa
A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
Origin of tuffFrench tuf, from Old French, from Old Italian tufo, tufa; see tufa.
(comparative tuffer, superlative tuffest)
- older and simplified spelling of tough
(countable and uncountable, plural tuffs)
- (geology) A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.