- 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. 2018
- a variety of the volcanic rock tuff, used to make a hydraulic cement
from Dutch tras, tarasse, from Italian terrazza worthless earth; see terrace