The natural hydrated form of calcium sulfate; a component of the stones, plasters, and investments used in dentistry. [L. fr. G. gypsos]
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gyp·sum 'jip-səm n a widely distributed mineral CaSO4·2H2O consisting of hydrous calcium sulfate that is used esp. as a soil amendment and in making plaster of paris
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n.
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gyp·sum (jipґsəm) [L., from Gr. gypsos chalk] native calcium sulfate dihydrate (see calcium sulfate;); when calcined, it becomes plaster of Paris.Medical dictionary. 2011.