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trass

[tras]
noun
  1. a light-colored type of volcanic tuff used in making water-resistant cement and mortar.
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Also called tar·ras [tuh-ras] /təˈræs/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for trasses

trass

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