annulus in English dictionary

  • annulus

    Meanings and definitions of "annulus"

    • A ring- or donut-shaped area or structure.
    • (mathematics) The region between two concentric circles of different radius.
    • (astronomy) The ring of the sun not covered by the moon in an annular solar eclipse.
    • (botany) Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
    • (mycology) The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
    • (oil and gas production) The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.
    • noun
      A ring- or donut-shaped area or structure.
    • noun
      (geometry)
      The region in a plane between two concentric circles of different radius.
    • noun
      (topology)
      Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.
    • noun
      (astronomy)
      The ring of the sun not covered by the moon in an annular solar eclipse.
    • noun
      (botany)
      Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
    • noun
      (mycology)
      The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
    • noun
      (oil and gas production)
      The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.
    • ring-shaped structure
    • noun
      a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
    • noun
      (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar

    Synonyms of "annulus" in English dictionary

    doughnut, plant structure, toroid are the top synonyms of "annulus" in the English thesaurus.

    Grammar and declension of annulus

    • annulus ( plural  annuluses  or annuli)
    • annulus (plural annuluses or annuli)
  • Annulus

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