【化】 硅酸盐水泥

[ noun ]
a cement that hardens under water; made by heating limestone and clay in a kiln and pulverizing the result
<noun.substance>

Portland cement \Port"land ce*ment"\
A cement having the color of the Portland stone of England,
made by calcining an artificial mixture of carbonate of lime
and clay, or sometimes certain natural limestones or chalky
clays. It contains a large proportion of clay, and hardens
under water.