an·nu·let /ˈænjələt/
  小環,輪狀環緣
  An·nu·let n.
  1. A little ring.
  2. Arch. 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.
  3. Her. A little circle borne as a charge.
  4. Zool. A narrow circle of some distinct color on a surface or round an organ.
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  annulet
       n 1: a charge in the shape of a circle; a hollow roundel [syn: roundel]
       2: molding in the form of a ring; at top of a column [syn: bandelet,
           bandelette, bandlet, square and rabbet]
       3: a small ring