Noun annulus has 2 senses
  1. ring, halo, annulus, anulus, doughnut, anchor ring - a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
    --1 is a kind of toroid
    --1 has particulars: fairy ring, fairy circle
  2. annulus - (Fungi) remnant of the partial veil that in mature mushrooms surrounds the lower part of the stem
    --2 is a kind of
    plant part, plant structure
    --2 is a part of partial veil, velum
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