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
From Old English tÅh, from Proto-Germanic *tanhuz
(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.