trass

[ tras ]
/ træs /
|

noun

a light-colored type of volcanic tuff used in making water-resistant cement and mortar.
Also called tar·ras [tuh-ras] /təˈræs/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for trass

trass

/ (træs) /

noun

a variety of the volcanic rock tuff, used to make a hydraulic cement

Word Origin for trass

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