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terras |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Terras \Ter"ras\, n. (Min.) See {?rass}. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Trass \Trass\, n. [D. tras or Gr trass, probably fr It terrazzo terrace. See {Terrace}.] (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. [Formerly written also {tarras}, {tarrace}, {terras}.] Note: The Dutch trass is made by burning and grinding a soft grayish rock found on the lower Rhine.
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