- 1[uncountable] a substance made of lime, water, and sand that is put on walls and ceilings to give them a smooth hard surface an old house with crumbling plaster and a leaking roof
- 2(less frequent plaster of Paris) [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 a plaster bust of Julius Caesar
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