annulus

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annulus

[′an·yə·ləs]
(anatomy)
Any ringlike anatomical part.
(botany)
An elastic ring of cells between the operculum and the mouth of the capsule in mosses.
A line of cells, partly or entirely surrounding the sporangium in ferns, which constricts, thus causing rupture of the sporangium to release spores.
A whorl resembling a calyx at the base of the strobilus in certain horsetails.
(mathematics)
The ringlike figure that lies between two concentric circles.
(mycology)
A ring of tissue representing the remnant of the veil around the stipe of some agarics.
References in periodicals archive ?
(20) "[...] sed ueteris prouerbii admonitu 'uiuorum memini'; nec tamen Epicuri licet obliuisci, si cupiam, cuius imaginem non modo in tabulis nostri familiares, sed etiam in poculis et in anulis habent".
In his dialogue Anuli, Alberti explains that the laurel represents joy and glory, and the eye the omniscience of God and an exhortation to intellectual watchfulness.
His dinner piece The Spider (Aranea) portrays an elephant as an arrogant colossus, and in Rings (Anuli) an elephant's ear is interpreted as an emblem of aural receptivity.