Hypertext Webster Gateway: "annulus"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Annulus \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.
From WordNet (r) 1.7 (wn)
annulus
n 1: a toroidal shape; "a ring of ships in the harbor"; "a halo
of smoke" [syn: {ring}, {halo}, {anulus}, {doughnut}, {anchor
ring}]
2: (fungi) remnant of the partial veil that in mature mushrooms
surrounds the lower part of the stem
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