Definition of trass in English:

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trass

Pronunciation: /tras/
(also tarras)

noun

[mass noun]
A light-coloured variety of volcanic ash resembling pozzolana, used in making water-resistant cement.
Example sentences
  • Although usually of lead, in Deptford the cooler was made of tarras, a cement which, like lead, did not dissolve in the acidic solution.

Origin

Late 18th century: from Dutch tras, German Trass, based on Latin terra 'earth'.

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