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What is the noun for annulus?

What's the noun for annulus? Here's the word you're looking for.

annulus
  1. A ring- or donut-shaped area or structure.
  2. (geometry) The region in a plane between two concentric circles of different radius.
  3. (topology) Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.
  4. (astronomy) The ring of the sun not covered by the moon in an annular solar eclipse.
  5. (botany) Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
  6. (mycology) The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
  7. (oil and gas production) The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.
  8. Synonyms:
  9. Examples:
    1. “The circus acrobat effortlessly balanced on the annulus, showcasing their incredible core strength.”
      “Within this recess we would find the curved remnants of the angular which actually form the tympanic annulus.”
      “The position of the annulus is a key character used to differentiate lineages within the clade.”
annule
  1. (zoology) A circular band formed by two transverse grooves in the cuticle of some nematodes with consequent apparent segmentation; annulus.
  2. Examples:
    1. “La Cour de cassation a annule ces verdicts en janvier, ordonnant un nouveau proces pour les huit accuses.”
annularity
  1. The property of being annular.
annuli
  1. plural form of annulus
  2. Synonyms:
  3. Examples:
    1. “No tortoise had sufficient wear to the carapace or plastron to obscure annuli.”
      “Abdomen black, consisting of seven annuli or rings, besides the tail part, the last of which is edged with orange.”
      “An eye-like spot in the Wings of many Lepidoptera, consisting of annuli of different colours, inclosing a central spot or pupil.”
annuluses
annules
  1. plural of annule
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