calcium oxidecalcium oxide
a white, soft, caustic solid, CaO, prepared by heating calcium carbonate; lime: used in making mortar and plaster, in ceramics, etc.
A white, caustic, lumpy powder, CaO, used as a refractory, as a flux, in glassmaking, in waste treatment, in insecticides, as an industrial alkali, and in manufacturing steel, paper, and building materials. Also called calx . Also called lime 3. Also called quicklime .