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The Collaborative International Dictionary
Cornice ring

Cornice \Cor"nice\ (k?r"n?s), 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.

Cornice ring, the ring on a cannon next behind the muzzle ring.

Wiktionary
cornice ring

n. The ring on a cannon next behind the muzzle ring.