plaster of Paris: see gypsum gypsum , 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.
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plaster of paris

Quick-setting gypsum plaster consisting of a fine white powder, calcium sulfate hemihydrate, which hardens when moistened and allowed to dry. It is made by heating gypsum to 250–360°F (120–180°C). Used since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found in Paris. It is used to make molds and casts for ceramics and sculptures, to precast and hold ornamental plasterwork on ceilings and cornices, and for orthopedic bandages (casts). In medieval and Renaissance times, gesso (plaster of paris mixed with glue) was applied to wood panels, plaster, stone, or canvas to provide the ground for tempera and oil painting.

plaster of paris [′plas·tər əv ′par·əs]

(inorganic chemistry)

White powder consisting essentially of the hemihydrate of calcium sulfate (CaSO₄·½H₂O 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.

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No references found	Against one wall was a plaster of Paris plaque of an O'Callahan in a Roman helmet. The Four Million by Henry, O. View in context "He'll always be lame," the surgeon said, wiping his hands and gazing down at Michael, who lay, for the most part of him, a motionless prisoner set in plaster of Paris. Michael, Brother of Jerry by London, Jack View in context I saw iron ladles, pans full of white sand, files with white metal left glittering in their teeth, molds of plaster of Paris, bags containing the same material in powder, a powerful machine with the name and use of which I was theoretically not unacquainted, white metal in a partially-fused state, bottles of aquafortis, dies scattered over a dresser, crucibles, sandpaper, bars of metal, and edged tools in plenty, of the strangest construction. A Rogue's Life by Collins, Wilkie View in context	Plasmon plasmosome plasmotomy Plassey Plast Plasteline Plaster plaster aggregate Plaster and Stucco plaster arch plaster base plaster bat plaster bead plaster bond Plaster Cast plaster casting plaster ceiling panel plaster coat plaster conglomerate plaster cornice plaster cove plaster ground plaster guard plaster head plaster lath plaster of paris plaster ring plaster screed plaster set plaster shooting plaster staff plaster stop plaster wainscot cap plaster-base finish tile plaster-base nail plasterboard plasterboard nail plasterer's putty plastering Plastering and Stuccoing plasterwork plastic Plastic Arts Plastic Ball plastic bonding plastic bronze plastic cement plastic clay plastic collision plastic conduit plastic consistency	plaster base plaster bat plaster bead Plaster board Plaster board plaster bond plaster cast plaster cast plaster cast plaster cast Plaster Cast and Wound Dressing plaster cast lung plaster casting plaster casts plaster casts plaster casts plaster casts plaster ceiling panel plaster coat plaster conglomerate plaster cornice plaster cove plaster ground plaster guard plaster hair down plaster head plaster headcap plaster headcap plaster headcap plaster lath plaster of paris Plaster of Paris bandage plaster on plaster onto plaster over plaster over plaster ring plaster rolls plaster rolls plaster rolls plaster saint plaster saints plaster scissors plaster scissors plaster scissors plaster screed plaster screed plaster set plaster shears plaster shears plaster shears plaster shooting plaster spreader plaster spreader plaster spreader plaster staff Plaster stone plaster stop plaster up plaster wainscot cap plaster with

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Against one wall was a plaster of Paris plaque of an O'Callahan in a Roman helmet.

The Four Million by Henry, O. View in context

"He'll always be lame," the surgeon said, wiping his hands and gazing down at Michael, who lay, for the most part of him, a motionless prisoner set in plaster of Paris.

Michael, Brother of Jerry by London, Jack View in context

I saw iron ladles, pans full of white sand, files with white metal left glittering in their teeth, molds of plaster of Paris, bags containing the same material in powder, a powerful machine with the name and use of which I was theoretically not unacquainted, white metal in a partially-fused state, bottles of aquafortis, dies scattered over a dresser, crucibles, sandpaper, bars of metal, and edged tools in plenty, of the strangest construction.

A Rogue's Life by Collins, Wilkie View in context

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