Plaster is a smooth paste made of sand, lime, and water which goes hard when it dries. Plaster is used to cover walls and ceilings and is also used to make sculptures.
A plaster is a strip of sticky material used for covering small cuts or sores on your body.
PHRASE
打着石膏;上着筒形石膏夹
If you have a leg or arm in plaster, you have a cover made of plaster of Paris around your leg or arm, in order to protect a broken bone and allow it to mend.