annulus

Noun
  1. A toroidal shape (synset 113898031)
    "a ring of ships in the harbor"; "a halo of smoke"
    is a type of: toroid - the doughnut-shaped object enclosed by a torus
    subtypes: fairy circle, fairy ring - a ring of fungi marking the periphery of the perennial underground growth of the mycelium
    same as: anchor ring, doughnut, halo, ring
  2. (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar (synset 113116107)
    referred to in: fungi, fungus kingdom, kingdom fungi - the taxonomic kingdom including yeast, molds, smuts, mushrooms, and toadstools; distinct from the green plants
    is a type of: plant part, plant structure - any part of a plant or fungus
    is a part of: partial veil - membrane of the young sporophore of various mushrooms extending from the margin of the cap to the stem and is ruptured by growth; represented in mature mushroom by an annulus around the stem and sometimes a cortina on the margin of the cap
    same as: skirt

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