Definition of plaster of paris
: 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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Merriam-Webster unabridged
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Time Traveler for plaster of paris
The first known use of plaster of paris was in the 15th century
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