plaster of Paris

noun
🔊/ˌplɑːstər əv ˈpærɪs/
🔊/ˌplæstər əv ˈpærɪs/
(also plaster)
[uncountable]
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  1. a white powder that is mixed with water and becomes very hard when it dries, used especially for making copies of statues or holding broken bones in place建筑石膏;熟石膏