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noun Trass n. (Formerly written also tarras, tarrace, terras) (Geol.) 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. Note: The Dutch trass is made by burning and grinding a soft grayish rock found on the lower Rhine.
Collaborative International Dictionary of English 0.48
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