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tufa

[too-fuh, tyoo-] /ˈtu fə, ˈtyu-/
noun, Geology
1.
Also called calcareous tufa, calc-tufa, calc-tuff. a porous limestone formed from calcium carbonate deposited by springs or the like.
Compare travertine.
2.
(not in technical use) tuff 2 .
Origin
1760-1770
1760-70; < Italian tufo < Latin tōfus
Related forms
tufaceous
[too-fey-shuh s, tyoo-] /tuˈfeɪ ʃəs, tyu-/ (Show IPA),
adjective

calc-tufa

[kalk-too-fuh, -tyoo-] /ˈkælkˌtu fə, -ˌtyu-/
noun
1.
tufa (def 1).
Also, calc-tuff
[kalk-tuhf] /ˈkælkˌtʌf/ (Show IPA)
.
Origin
1815-25; calc- + tufa
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for calc-tuff

calc-tufa

/ˈkælkˌtuːfə/
noun
1.
another name for tufa

tufa

/ˈtjuːfə/
noun
1.
a soft porous rock consisting of calcium carbonate deposited from springs rich in lime Also called calc-tufa
Derived Forms
tufaceous (tjuːˈfeɪʃəs) adjective
Word Origin
C18: from Italian tufo, from Late Latin tōfus
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
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Word Origin and History for calc-tuff

tufa

n.

"a porous rock," 1770, from Italian tufa "tufa, porous rock," probably from Latin tufus, tophus "loose, porous volcanic rock," said to be an Oscan-Umbrian loan-word.

Online Etymology Dictionary, © 2010 Douglas Harper
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calc-tuff in Science
tufa
  (t'fə)   
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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