trass

Pronunciation: /tɹɑːs/

The English word “trass” has 2 meanings listed here.

noun

A whitish, greyish volcanic tufa, formed of decomposed trachytic cinders, sometimes used as a cement.
A coarse sort of plaster or mortar, durable in water, formerly used to line cisterns and other reservoirs of water.

From Dutch tras or German Trass, probably from Italian terrazzo (“terrace”). See terrace.

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