Adjacent Words

annulus definitions

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WordNet (r) 3.0 (2005)

n
1: a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke" [syn: ring, halo, annulus, doughnut, anchor ring]
2: (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar [syn: annulus, skirt]

Merriam Webster's

noun (plural annuli; also -luses) Etymology: Medieval Latin, from Latin anulus finger ring, from anus ring — more at anus Date: 1563 1. ring 2. a part, structure, or marking resembling a ring: as a. a line of cells around a fern sporangium that ruptures the sporangium by contracting b. a growth ring (as on the scale of a fish) that is used in estimating age

Oxford Reference Dictionary

n. (pl. annuli) esp. Math. & Biol. a ring. Etymology: L an(n)ulus

Webster's 1913 Dictionary

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.