cornice ring

noun3

1. •
   A round moulding that encircles the base or top of a structural element, such as the architrave of a pillar, the terminus of a round pipe, the base of a cupola, etc.

   • The pendentives themselves visually support a cornice ring which then forms the base for the cupola. — 1993
2. •
   (historical) The ring on a cannon next to or behind the muzzle ring.

   • Gorgerin, m . The neck of a gun (which lies between the muzzle-mouldings and the cornice-ring.) — 1853
3. •
   One of several matching rings that encircle a curtain rod and from which the curtain is suspended.

   • The Patentees made no claim to any special form of hook or attachment to the curtain rod, or cornice ring. — 1915