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volcanic tuff

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tuff

2  [tuhf]
–noun Geology.
a fragmental rock consisting of the smaller kinds of volcanic detritus, as ash or cinder, usually more or less stratified.
Also called volcanic tuff.

Origin:
1560–70; < F tuf < It tufo. See tufa

Related forms:
tuff⋅a⋅ceous  [tuh-fey-shuhs] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Word Origin & History

tuff 
1569, "rock of consolidated volcanic fragments," from M.Fr. tuf, from It. tufa "tufa, porous rock," probably from L. tufus, tophus (see tufa).
Online Etymology Dictionary, © 2001 Douglas Harper
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Science Dictionary
tuff   (tŭf)  Pronunciation Key 
A rock made up of particles of volcanic ash, varying in size from fine sand to coarse gravel.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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