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A soft, friable, and porous sedimentary rock consisting of calcium carbonate and formed by the evaporation of water, especially at the mouth of a hot spring or on a drying lakebed. It can also be precipitated by algae or bacteria.
[Obsolete Italian tufa, tufo, from Latin tōfus.]
tu·fa′ceous (-fā′shəs) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Minerals) a soft porous rock consisting of calcium carbonate deposited from springs rich in lime. Also called: calc-tufa
[C18: from Italian tufo, from Late Latin tōfus]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
tu•fa(ˈtu fə, ˈtyu-)
a porous limestone formed from calcium carbonate deposited by springs or the like.
[1760–70; < Italian tufo tuff < Latin tōfus, tūfus]
tu•fa′ceous (-ˈfeɪ ʃəs) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A rock formed of sediments deposited during the evaporation of lake water, spring water, or groundwater. Tufa is usually composed of calcium carbonate.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||tufa - a soft porous rock consisting of calcium carbonate deposited from springs rich in lime|
|2.||tufa - hard volcanic rock composed of compacted volcanic ash|
volcanic rock - extrusive igneous rock solidified near or on the surface of the Earth
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