trass

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الإنجليزية - الإنجليزية
{n} a gray or yellowish porous stone
Hence, a coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water
A light-colored tuff used in hydraulic cement
A white to gray volcanic tufa, formed of decomposed trachytic cinders; sometimes used as a cement
trass
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