D defs.my
Entry 1 sense Webster, 1913

Cornice

/(k?r"n?s)/ · Cor·nice · IPA /ˈkoɹnɪs/
01 n. Any horizontal, molded or otherwise decorated projection which crowns or finishes the part to which it is affixed; as, the cornice of an or…
  1. 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.