Etymology
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annulus (n.)

1560s in medical use, "ring-like area or space," from a Medieval Latin misspelling of Latin anulus "little ring, finger ring," a diminutive of anus "ring" (see anus).

updated on January 15, 2017

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Definitions of annulus from WordNet

annulus (n.)
a toroidal shape;
Synonyms: ring / halo / doughnut / anchor ring
annulus (n.)
(Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar;
Synonyms: skirt
From wordnet.princeton.edu, not affiliated with etymonline.