Oxford Dictionary English

    plaster cast

    noun
    noun
    BrE BrE//ˈplɑːstə kɑːst//
    ; NAmE NAmE//ˈplæstər kæst//
    Medical equipment, Injuries
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  1. 1(also cast) a case made of plaster of Paris that covers a broken bone and protects it
  2. 2a copy of something, made from plaster of Paris They took a plaster cast of the teeth for identification purposes.
See plaster cast in the Oxford Advanced American Dictionary
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