|Origin:||emplastrum, from Greek, from emplassein 'to plaster on', from plassein; PLASTIC2|
a substance used to cover walls and ceilings with a smooth, even surface. It consists of lime, water, and sand.
plaster of Paris
3 [uncountable and countable] British EnglishMH
a piece of thin material that is stuck on to the skin to cover a small wound [= bandaid American English]
4 British EnglishMH
if you have a leg or arm in plaster, you have a plaster cast around it because a bone is broken and needs to be kept in place while it mends