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an·nu·lus (ăn'yə-ləs)
n., pl., -lus·es, or -li (-lī').
  1. A ringlike figure, part, structure, or marking, such as a growth ring on the scale of a fish.
    1. A ring or group of thick-walled cells around the sporangia of many ferns that functions in spore release.
    2. The ringlike remains of a broken partial veil, found around the stipes of certain mushrooms.
  2. Mathematics. The figure bounded by and containing the area between two concentric circles.

[Latin ānulus, ring, diminutive of ānus.]




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