[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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