Examples from the Web for trass
Sometimes a proportion of common sand mortar instead of lime is mixed with the trass.A Dictionary of Arts, Manufactures and Mines|Andrew Ure
Trass, tras, n. a volcanic earth used as a hydraulic cement.
It is evident that this will form a pozzuolanic cement if a suitable silicious material such as trass is added to the cement.
But the Trass boy finished his remarks about destiny in a very short time.
He wished that the Trass boy would talk forever about destiny.