Cornice /(k?r"n?s)/

Cor·nice

Cornice

n.
  1. Any horizontal, molded or otherwise decorated projection which crowns or finishes the part to which it is affixed; as, the cornice of an order, pedestal, door, window, or house. (Arch.)

Phrases & Compounds
Cornice ring
the ring on a cannon next behind the muzzle ring.