English dictionary
trass
/tr/&/s/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
-
A white to gray volcanic tufa, formed of decomposed trachytic cinders; -- sometimes used as a cement. Hence, a coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water.
Source: webster1913