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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 calctuff

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 calctuff

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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calctuff 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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18
22
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