[too-fuh, tyoo-]
noun Geology.
Also called calcareous tufa, calc-tufa, calc-tuff. a porous limestone formed from calcium carbonate deposited by springs or the like. Compare travertine.
(not in technical use) tuff 2 .

1760–70; < Italian tufo < Latin tōfus

tufaceous [too-fey-shuhs, tyoo-] , adjective
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World English Dictionary
tufa (ˈtjuːfə)
Also called: calc-tufa a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
[C18: from Italian tufo, from Late Latin tōfus]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"a porous rock," 1770, from It. tufa, from L. tophus "loose, porous volcanic rock," an Oscan-Umbrian loan-word.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
tufa   (t'fə)  Pronunciation Key 
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 is similar to, but harder than, travertine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The tufa towers formed entirely underwater and have been exposed due to the decline in lake level.
Tufa, deposited by a combination of organic and inorganic processes, is widespread.
Tufa is a rock formation composed of calcium carbonate that forms underwater in places where lake water mixes with spring water.
When the lake level falls, the tufa formations are exposed.
Images for tufa
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