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calcium carbide a dark gray crystalline compound used as a dehydrating agent and a source of acetylene gas and calcium cyanimide.
calcium carbonate a white crystalline compound found in chalk, limestone, marble, shells, and plant ash that is used in the manufacture of cement, paints, plastics, and polishing agents such as toothpaste.
calcium chloride a white crystalline compound, derived from calcium carbonate, that is used as a dehydrating agent, de-icer, and dust suppressant.
calcium cyanamide a white powder used mainly as a fertilizer or weed killer; cyanamide.
calcium fluoride a white powder used in cements and other industrial products and as a tooth decay preventive.
calcium hydroxide a soft white crystalline compound made by the action of water on calcium oxide and used in the manufacture of cement, plaster, hard rubber products, and bleaching powder; slaked lime.
calcium oxide a soft white caustic powder used in the treatment of waste, as an industrial alkali, and in the manufacture of steel, glass, plaster, and insecticides; lime; quicklime.
calcium phosphate any of a number of phosphates of calcium found in some rocks and in animal bones, used in baking powder and plant food, and in the manufacture of enamels, plastics, and cleaning agents.