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plaster of paris

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plaster of paris

Main Entry:: plaster of par·is
Pronunciation:: \-ˈpa-rəs\
Usage:: often capitalized 2d P
Etymology:: Paris, France
Date:: 15th century

: a white powdery slightly hydrated calcium sulfate CaSO₄·¹⁄₂H₂O or 2CaSO₄·H₂O made by calcining gypsum and used chiefly for casts and molds in the form of a quick-setting paste with water

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