plaster of Paris
noun/ˌplɑːstər əv ˈpærɪs/
/ˌplæstər əv ˈpærɪs/
(also more frequent plaster)
[uncountable]- 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
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plaster of Paris