tuffaceous

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; < French tuf < Italian tufo. See tufa

tuffaceous [tuh-fey-shuhs] , adjective
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World English Dictionary
tuff (tʌf)
 
n
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

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Etymonline
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, © 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
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