- 1. n. 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. Source: opted
- 2. 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. Source: webster
- 3. A white to gray volcanic tufa, formed of decomposed trachyticcinders; -- sometimes used as a cement. Hence, a coarse sort ofplaster or mortar, durable in water, and used to line cisterns andother reservoirs of water. [Formerly written also tarras, tarrace,terras.] Source: adambom
- 4. n. 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. Source: ecdict
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