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
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