ETYM Dim. of annulus.
1. A charge in the shape of a circle; a hollow roundel; SYN. roundel.
2. A small ring.
SYN. bandelet, bandelette, bandlet, squar and rabbet.

Molding in the form of a ring; at top of a column;
Small ring around a classical column.
Architecture, fillet or ring round column, especially on Doric capital.