[ tuhf ]
/ tʌf /
a fragmental rock consisting of the smaller kinds of volcanic detritus, as ash or cinder, usually more or less stratified.
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. 2019
Examples from the Web for tuffaceous
Agglomeratic and tuffaceous rocks are of quite common occurrence, although less important than the lavas.Mount Rainier|Various
British Dictionary definitions for tuffaceous
/ (tʌf) /
a rock formed by the fusing together on the ground of small rock fragments (less than 2 mm across) ejected from a volcano
Derived Formstuffaceous (tʌˈfeɪʃəs), adjective
Word Origin for tuff
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
Science definitions for tuffaceous
[ tŭf ]
A rock made up of particles of volcanic ash, varying in size from fine sand to coarse gravel.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.