1.  annulet(n = noun.artifact) roundel - (heraldry) a charge in the shape of a circle; "a hollow roundel"
is a kind of armorial bearing, bearing, charge, heraldic bearing

2.  annulet(n = noun.artifact) bandelet, bandelette, bandlet, square and rabbet - molding in the form of a ring; at top of a column;
is a kind of molding, moulding

3.  annulet(n = noun.artifact) - a small ring;
is a kind of band, ring

1.  A little ring. Tennyson. [1913 Webster]

2.  A small, flat fillet, encircling a column, etc., used by itself, or with other moldings. It is used, several times repeated, under the Doric capital. [1913 Webster]

3.  A little circle borne as a charge. [1913 Webster]

4.  A narrow circle of some distinct color on a surface or round an organ. [1913 Webster]

annulet, n.
1 Archit. a small fillet or band encircling a column.
2 a small ring.

Etymology:
L annulus ring + -ET(1)

N  circularity, roundness, rotundity, circle, circlet, ring, areola, hoop, roundlet, annulus, annulet, bracelet, armlet, ringlet, eye, loop, wheel, cycle, orb, orbit, rundle, zone, belt, cordon, band, contrate wheel, crown wheel, hub, nave, sash, girdle, cestus, cincture, baldric, fillet, fascia, wreath, garland, crown, corona, coronet, chaplet, snood, necklace, collar, noose, lasso, lassoo, ellipse, oval, ovule, ellipsoid, cycloid, epicycloid, epicycle, semicircle, quadrant, sextant, sector, sphere, round, rounded, circular, annular, orbicular, oval, ovate, elliptic, elliptical, egg-shaped, pear-shaped, cycloidal, spherical, I watched the little circles die.