What is the meaning of Trass?

A white to grey volcanic tufa, formed of decomposed trachytic cinders, sometimes used as a cement.

A coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water.

defiance, obstinacy

in spite of

spite, stubbornness, contrariness, defiance

despite

Source: wiktionary.org