Found 2 items, similar to Annulus.
English → English (WordNet) Definition: annulus 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)]
English → English (gcide) Definition: Annulus 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. (Zo["o]l.) Ring-shaped structures or markings, found in, or upon, various animals. [1913 Webster]