If a part of your body is in plaster, it has a plaster cast around it to protect it while a broken bone repairs itself.

My leg was in plaster for about six weeks. 我的腿打了6周左右的石膏。

The patient was in plaster from head to toe, with openings for his eyes and mouth.

He spent several weeks with his ankle in plaster.

Last time I saw you, you had your arm in plaster.

Her leg was in plaster from a skiing accident.

See also: plaster noun (SUBSTANCE)