tuff

tuff  (tf)

n.

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

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[French tuf, from Old French, from Old Italian tufo, tufa; see tufa.]

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tuff·aceous (t-fshs) adj.

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tuff [tʌf]

n

(Earth Sciences / Geological Science) a rock formed by the fusing together on the ground of small rock fragments (less than 2 mm across) ejected from a volcano

[from Old French tuf, from Italian tufo; see tufa]

tuffaceous  [tʌˈfeɪʃəs] adj

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tuff  (tf)

A rock made up of particles of volcanic ash, varying in size from fine sand to coarse gravel.

Thesaurus

Noun

1.

tuff - hard volcanic rock composed of compacted volcanic ash tufa volcanic rock - extrusive igneous rock solidified near or on the surface of the Earth