The underside of the corona of a cornice; any soffit of a cornice.
Origin
Mid 17th century. Probably alteration of plancher, perhaps after an unattested French form; compare Anglo-Norman plancié floor, Old French plancier floor.
Definition of planceer in US English:
planceer
nounplanˈsɪə
Architecture
The underside of the corona of a cornice; any soffit of a cornice.
Origin
Mid 17th century. Probably alteration of plancher, perhaps after an unattested French form; compare Anglo-Norman plancié floor, Old French plancier floor.