plaster of Paris
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plaster of Paris:see gypsumgypsum
, mineral composed of calcium sulfate (calcium, sulfur, and oxygen) with two molecules of water, CaSO4·2H2O. It is the most common sulfate mineral, occurring in many places in a variety of forms. A transparent crystalline variety is selenite.
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Plaster of paris
A gypsum substance especially suitable for fine ornamental plasterwork because it fills a mold completely and dries quickly.
plaster of paris[′plas·tər əv ′par·əs]
White powder consisting essentially of the hemihydrate of calcium sulfate (CaSO4·½H2 O or 2CaSO4·H2O), produced by calcining gypsum until it is partially dehydrated; forms with water a paste that quickly sets; used for casts and molds, building materials, and surgical bandages. Also known as calcined gypsum.
plaster of paris, hemihydrate plaster
1. Calcined gypsum, containing no additives to control the set; a rapid-setting plaster used mainly for ornamental casting.
2. Gauging plaster.