calcium sulfate

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Noun1.calcium sulfate - a white salt (CaSO4)
gypsum - a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)
plaster of Paris, plaster - any of several gypsum cements; a white powder (a form of calcium sulphate) that forms a paste when mixed with water and hardens into a solid; used in making molds and sculptures and casts for broken limbs
salt - a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal)