GNU Collaborative International Dictionary of English

Found one definition

1.       
   Cornice , n. [F. corniche, It. cornice, LL. coronix, cornix, fr. L.  coronis a curved line, a flourish with the pen at the end of a book or chapter, Gr. ; akin to L.  corona crown. sEE Crown, and cf.  Coronis.] (Arch.) 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.
   Gwilt.
   
   1913 Webster
   Cornice ring, the ring on a cannon next behind the muzzle ring.
   1913 Webster