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tuff2

[tuhf]
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noun Geology.
  1. a fragmental rock consisting of the smaller kinds of volcanic detritus, as ash or cinder, usually more or less stratified.
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Origin of tuff2

1560–70; < French tuf < Italian tufo. See tufa
Also called volcanic tuff.
Related formstuff·a·ceous [tuh-fey-shuh s] /tʌˈfeɪ ʃəs/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for tuffaceous

Historical Examples

  • Agglomeratic and tuffaceous rocks are of quite common occurrence, although less important than the lavas.

    Mount Rainier

    Various


British Dictionary definitions for tuffaceous

tuff

noun
  1. a rock formed by the fusing together on the ground of small rock fragments (less than 2 mm across) ejected from a volcano
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Derived Formstuffaceous (tʌˈfeɪʃəs), adjective

Word Origin

C16: from Old French tuf, from Italian tufo; see tufa
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for tuffaceous

tuff

adj.

advertiser's spelling of tough (adj.), attested by 1940.

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Online Etymology Dictionary, © 2010 Douglas Harper

tuffaceous in Science

tuff

[tŭf]
  1. A rock made up of particles of volcanic ash, varying in size from fine sand to coarse gravel.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.