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Definition of annulus:

  1. A ring; a ringlike part or space.
  2. A space contained between the circumferences of two circles, one within the other.
  3. Ring- shaped structures or markings, found in, or upon, various animals.
  4. The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.


closed chain, ring, aura, bird, anulus, glory, nimbus, doll, tintinnabulation, gang, wench, chick, hoop, dame, aureole, pack, mob, sinker, skirt, anchor ring, ringing, donut, doughnut, band, gloriole, halo.

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