plaster casting
/ˈplɑːstə ˌkɑːstɪŋ/ /ˈplastə ˌkastɪŋ/noun
The action of casting in plaster or of applying a plaster cast. Also concrete : a plaster cast.
Origin
Mid 19th century; earliest use found in George W. Francis (1800–1865), botanist. From plaster + casting, after plaster cast.