annulus

Definitions of annulus
  1. noun
    a toroidal shape
    synonyms: anchor ring, doughnut, halo, ring
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    types:
    fairy circle, fairy ring
    a ring of fungi marking the periphery of the perennial underground growth of the mycelium
    type of:
    toroid
    the doughnut-shaped object enclosed by a torus
  2. noun
    (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar
    synonyms: skirt
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    type of:
    plant part, plant structure
    any part of a plant or fungus
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