GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Annulus , n.; pl. Annuli . [L.]
    A ring; a ringlike part or space.
   1913 Webster
   (Geom.) (a) A space contained between the circumferences of two circles, one within the other. (b) The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.
   1913 Webster
   (Zool.) Ring-shaped structures or markings, found in, or upon, various animals.
   1913 Webster