tuff

(tuf)

noun

a porous igneous rock, usually stratified, formed by consolidation of volcanic ash, dust, etc.

Origin: Fr tuf, earlier tufe, tuffe < It tufo, tufa

Related Forms:

See tuff in American Heritage Dictionary 4

noun

A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel. Also called tufa.

Origin:

Origin: French tuf

Origin: , from Old French

Origin: , from Old Italian tufo, tufa; see tufa

Related Forms:

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