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trass

[tras] /træs/
noun
1.
a light-colored type of volcanic tuff used in making water-resistant cement and mortar.
Also called tarras.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for trass

trass

/træs/
noun
1.
a variety of the volcanic rock tuff, used to make a hydraulic cement
Word Origin
from Dutch tras, tarasse, from Italian terrazza worthless earth; see terrace
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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