tuff

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tuff

 (tŭf)
n.
A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.

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

tuff·a′ceous (tŭ-fā′shəs) adj.

tuff

(tʌf)
n
(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
[C16: from Old French tuf, from Italian tufo; see tufa]
tuffaceous adj

tuff

(tʌf)

n.
a fragmental rock consisting of the smaller kinds of volcanic detritus, as ash or cinder, usu. more or less stratified.
[1560–70; < Middle French tuf(e) < Italian tufo. See tufa]
tuff•a′ceous, adj.

tuff

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

tuff

A rock made up of compacted volcanic ash; also known as tufa.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tuff - hard volcanic rock composed of compacted volcanic ashtuff - hard volcanic rock composed of compacted volcanic ash
volcanic rock - extrusive igneous rock solidified near or on the surface of the Earth