2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Annulus \An"nu*lus\, n.; pl. {Annuli}. [L.] 1. A ring; a ringlike part or space. [1913 Webster] 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. [1913 Webster] 3. (Zool.) Ring-shaped structures or markings, found in, or upon, various animals. [1913 Webster] From WordNet (r) 2.0 [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 [also: {annuli} (pl)]
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