Definitions for: Annulus


[n] (fungi) remnant of the partial veil that in mature mushrooms surrounds the lower part of the stem
[n] a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"



Webster (1913) Definition: An"nu*lus, n.; pl. Annuli. [L.]
1. A ring; a ringlike part or space.

2. (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.

3. (Zo["o]l.) Ring-shaped structures or markings, found in,
or upon, various animals.

Synonyms: anchor ring, anulus, doughnut, halo, ring

See Also: fairy circle, fairy ring, partial veil, plant part, toroid, velum

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