tuff definition by Webster's New World
a porous igneous rock, usually stratified, formed by consolidation of volcanic ash, dust, etc.
Origin: French tuf, earlier tufe, tuffe ; from Italian tufo, tufa
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- tuffaceous adjective
tuff definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel. Also called tufa.
Origin: French tuf, from Old French, from Old Italian tufo, tufa; see tufa.
- tuff·aˈceous adjective
tuff - Science Definition
A rock made up of particles of volcanic ash, varying in size from fine sand to coarse gravel.