CEMENT, n. A powdered, kiln-fired mixture of alumina, silica, lime, iron oxide, and magnesium oxide which, when properly hydrated and allowed to set, approximates the impenetrability of the human head.
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CEMENT, n. A powdered, kiln-fired mixture of alumina, silica, lime, iron oxide, and magnesium oxide which, when properly hydrated and allowed to set, approximates the impenetrability of the human head.