noun
- a volcanic rock used in making hydraulic cement
Usage: geology; construction
Examples
- The ancient Romans used trass from the Rhine valley in their concrete.
- Trass is valued for its pozzolanic properties in cement production.
- The quarry produces high-quality trass for the construction industry.
- German trass has been exported worldwide for hydraulic cement.
- The volcanic trass creates a durable waterproof cement when mixed properly.