trass

[tras]

noun

1. a light-colored type of volcanic tuff used in making water-resistant cement and mortar.

trass

/ træs /

noun

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

Word History and Origins

Origin of trass¹

First recorded in 1790–1800; from Dutch trass, from earlier terass, tieras, tiras “brick dust, rubbish,” from French terrasse; terrace ( def. )

Word History and Origins

Origin of trass¹

from Dutch tras, tarasse, from Italian terrazza worthless earth; see _terrace