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trass - What does it mean?

Definition of 'trass'

English

Alternative forms

* tarrace * tarras * terras

Noun

(-)
  • (geology) 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.
  • (Webster 1913)