plaster of Paris

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plaster

 [plas´ter]
1. a mixture of materials that hardens; used for immobilizing or making impressions of body parts.
2. an adhesive substance spread on fabric or other suitable backing material, for application to the skin, often containing some medication, such as an analgesic or local vasodilator.
plaster of Paris calcium sulfate dihydrate, reduced to a fine powder; the addition of water produces a porous mass used in making casts and bandages to support or immobilize body parts, and in dentistry for making study models.

plas·'ter of Par·is

exsiccated calcium sulfate from which the water of crystallization has been expelled by heat, but which, when mixed with water, will form a paste that subsequently sets.

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.

plas·ter of Par·is

(plas'tĕr par'is)
Any of a group of gypsum cements, essentially hemihydrated calcium sulfate, a white powder that forms a paste when mixed with water and then hardens into a solid; used in making casts, molds, and sculpture.
[L. plastrum, plaster + Paris, France]

plaster of Paris

A white powder of dried calcium sulphate dihydrate which, mixed with water, gives off heat and hardens. Reinforced with loose bandage it forms a strong and useful support (CAST) or dental mould.

Paris,

city in France.
plaster of Paris - a gypsum material used for making casts.

plas·ter of Par·is

(plas'tĕr par'is)
Exsiccated calcium sulfate from which water of crystallization has been expelled by heat, but which, when mixed with water, forms a paste that then sets.
[L. plastrum, plaster + Paris, France]