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definition of the word annulus

by the Wiktionnary

Singular
annulus

Plural
annuluses

annulus (plural annuluses)

  1. A ring- or donut-shaped area or structure.
  2. In mathematics, the region between two concentric circles of different radius.
  3. In astronomy, the ring of the sun not covered by the moon in an annular solar eclipse.
  4. (mycology) The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
Retrieved from "http://en.wiktionary.org/wiki/annulus"
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