cornice

Short definition from Wiktionary

Noun

1. 1
   A horizontal architectural element of a building, projecting forward from the main walls, originally used as a means of directing rainwater away from the building's walls.
2. 2
   A decorative element applied at the topmost part of the wall of a room, as with a crown molding.
3. 3
   A decorative element at the topmost portion of certain pieces of furniture, as with a highboy.
4. 4
   An overhanging edge of snow on a ridge or the crest of a mountain and along the sides of gullies.

Verb

1. 1
   To furnish or decorate with a cornice.