plaster of Paris

plaster of Paris

noun
calcined gypsum in white, powdery form, used as a base for gypsum plasters, as an additive of lime plasters, and as a material for making fine and ornamental casts: characterized by its ability to set rapidly when mixed with water.
Also, plaster of paris.


Origin:
1375–1425; late Middle English; so called because prepared from the gypsum of Paris, France

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World English Dictionary
plaster of Paris
 
n
1.  a white powder that sets to a hard solid when mixed with water, used for making sculptures and casts, as an additive for lime plasters, and for making casts for setting broken limbs. It is usually the hemihydrate of calcium sulphate, 2CaSO4.H2O
2.  the hard plaster produced when this powder is mixed with water: a fully hydrated form of calcium sulphate
 
[C15: from Medieval Latin plastrum parisiense, originally made from the gypsum of Paris]

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Medical Dictionary

plaster of Paris plaster of Par·is (pār'ĭs)
n.
Any of a group of gypsum cements, essentially hemihydrated calcium sulfate, a white powder that forms a paste when mixed with water and hardens into a solid, used in making casts and molds.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
plaster of Paris   (plās'tər)  Pronunciation Key 
A form of calcium phosphate derived from gypsum. It is mixed with water to make casts and molds.
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