ANNULUS

annulus, skirt

(noun) (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar

ring, halo, annulus, doughnut, anchor ring

(noun) a toroidal shape; “a ring of ships in the harbor”; “a halo of smoke”

Source: WordNet® 3.1

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Etymology

Noun

annulus (plural annuluses or annuli)

A ring- or donut-shaped area or structure.

(geometry) The region in a plane between two concentric circles of different radii.

(topology) Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.

(astronomy) The ring of the sun not covered by the moon in an annular solar eclipse.

(botany) Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.

(mycology) The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.

(oil and gas production) The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.

Synonyms

• (topological space): cylinder

Hyponyms

• (ring-shaped structure): torus

Source: Wiktionary

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An"nu*lus, n.; pl. Annuli. Etym: [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. (Zoöl.)

Definition: Ring-shaped structures or markings, found in, or upon, various animals.

Source: Webster’s Unabridged Dictionary 1913 Edition

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