plaster of Paris
nounUK /ˌplɑːstər əv ˈpærɪs/
US /ˌplæstər əv ˈpærɪs/
A soft white powder that becomes hard when you mix it with water.
The doctor used plaster of Paris to make a cast for my broken arm.
OTHER MEANINGS
2. A quick-setting paste used to make decorative molds and casts.
She poured plaster of Paris into the mold to make a small statue.
3. A material used in building for coating walls and ceilings.
The workers spread plaster of Paris over the wall to make it smooth.
4. A substance used by artists to create sculptures and models.
The art class used plaster of Paris to shape their clay models.