- 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. 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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watercementcinderscisternscoarsedecomposeddurableformedgrayhencelinemortarplasterreservoirssometimessorttrachytictufavolcanicwhite