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Word: annulus (lookup usage) (lookup stats)


Meaning:

Noun:

  • A ring- or donut-shaped area or structure.
  • astronomy The ring of the 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.
  • oil and gas production The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.
  • mathematics The region between two concentric circles of different radius.
  • mycology The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.

Source: Wiktionary | Src Info »