1 [tuhf]
adjective Slang.
tough ( def 13 ).
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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.

1560–70; < French tuf < Italian tufo. See tufa

tuffaceous [tuh-fey-shuhs] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tuff (tʌf)
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]

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Word Origin & History

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, © 2010 Douglas Harper
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American Heritage
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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Example sentences
Fuel cells are likely to be well suited for urban areas where it is tuff to imagine a battery charger by every parking space.
Wherever there are explosive volcanic eruptions you can expect to find tuff.
The presence of tuff intercalated with other rock types was unavoidable because of limitations in available data.
The tuff is exposed in the high cliffs in the canyon.
Image for tuff
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