cornish
n. countable C1 Advanced US //ˈkɔɹnɪʃ// cor·nish
n. a decorative border made of stone or wood that sits at the top of a wall or building. It often sticks out a little bit to help keep rain away from the walls.
n. a horizontal decorative moulding that crowns a building or furniture element. In architecture, it forms the uppermost part of an entablature and serves to throw rainwater away from the building's walls.
From Corn(wall) + -ish, from Cornish Kernewek, Kernowek.
Usage
Commonly refers to both internal ceiling decorations and external architectural features.