plasterof Paris

plasterof Paris
plaster of Paris n.
Any of a group of gypsum cements, essentially hemihydrated calcium sulfate, CaSO4· 1/2 H2O, a white powder that forms a paste when it is mixed with water and then hardens into a solid, used in making casts, molds, and sculpture.
  [Middle English, after Paris2 France.]

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Universalium. 2010.

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