From Longman Dictionary of Contemporary Englishplaster castˈplaster cast noun [countable] 1 MHa cover made from plaster of Paris, put around an arm, leg etc to keep a broken bone in place while it mends SYN cast2 AVSa copy of something that is made of plaster of Paris
Examples from the Corpus
plaster cast• One medium even claimed to have made a plaster cast of a pair of ectoplasmic hands before they dissolved.• Non-playing colleagues rushed him to the local casualty department, where a large plaster cast was fixed on to the injured area. 