1. 
   Tufa
   Cellular rock; porous limestone.
   Found op http://www.encyclo.co.uk/local/20018
   
   
2. 
   tufa
   [n] - a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
   Found op http://www.webdictionary.co.uk/definition.php?query=tufa
   
   
3. 
   Tufa
   a very light sponge-like limestone formed in aireated springs, and used decoratively eg in grottos or where lightness is important eg at the top of domes. - see Stone/stonework
   Found op http://www.encyclo.co.uk/local/20935
   
   
4. 
   Tufa
   A porous, grey stone of volcanic origin.
   Found op http://www.crsbi.ac.uk/resources/glossary.html
   
   
5. 
   tufa
   <chemical> A soft or porous stone formed by depositions from water, usually calcareous; called also calcareous tufa. ... A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria. ... Origin: It. Fufo soft, sandy stone, L. Tofus, tophus. Cf. Tofus, Toph, and Tophin. .....
   Found op http://www.mondofacto.com/facts/dictionary?tufa
   
   
6. 
   tufa
   calc-tufa noun a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=tufa
   
   
7. 
   Tufa
   • A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria. • A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa.
   Found op http://thinkexist.com/dictionary/meaning/tufa/
   
   
8. 
   TUFA
   Spongy or vesicular calcium carbonate deposited from spring, river or lake waters. Cf. travertine.
   Found op http://www.cancaver.ca/docs/glossary.htm
   
   
9. 
   tufa
   tufa: see travertine.
   Found op http://www.infoplease.com/ce6/sci/A0919803.html
   
   
10. 
    Tufa
    Tufa (tuff or toph) is a soft white porous rock of calcium carbonate deposited from solution in spring water or percolating ground water. When compact it is called Travertine. Much of it is exceedingly light, and resembles petrified sponge. Tufa is extremely durable, and was extensively used by the ...
    Found op http://www.probertencyclopaedia.com/browse/HT.HTM
    
    
11. 
    tufa
    Soft, porous, limestone rock, white in colour, deposited from solution from carbonate-saturated ground water around hot springs and in caves. Undersea tufa columns, such as those in the Ikka Fjord in southwestern Greenland, that form over alkaline springs, can reach 20 m/65 ft in height and grow at ...
    Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0015317.html
    
    
12. 
    tufa
    1) Calc-tufa 2) Cellular rock 3) Lime spring deposit 4) Porous limestone 5) Rock 6) Stone
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/tufa/1
    
    

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