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plaster of Paris ['plɑ:st(ə)rəv'pærɪs]
gypsum plaster
construct., med. 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 (merriam-webster.com)