Tuff meaning

tŭf
A porous igneous rock, usually stratified, formed by consolidation of volcanic ash, dust, etc.
noun
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A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
noun
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Older and simplified spelling of tough.

adjective
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(geology) A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
noun
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A rock made up of particles of volcanic ash, varying in size from fine sand to coarse gravel.
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Origin of tuff

  • French tuf from Old French from Old Italian tufo tufa tufa

    From American Heritage Dictionary of the English Language, 5th Edition

  • From French tuffe, tuf, from Italian tufo, from Latin tōfus.

    From Wiktionary

  • From Old English tōh, from Proto-Germanic *tanhuz

    From Wiktionary