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 ?
grout] are the density, specific heat, and thermal conductivity of the grout, respectively; T (j, 1) is the ground temperature for the jth slice and the first annular region (i.
The expansion factor is a parameter used to scale the mesh in the radial direction; it is the ratio between the thickness of the considered annular region and the previous one.
As also shown in the figure, the area under each palm was divided into 5 notional annular regions.
The data show a dense annular region surrounding a more dilute core region for both FCC and fluid coke particles.
The pressure to output relationship is developed for the annular region by assuming axial flow through a pair of rotating concentric cylinders.
After finding the center the image was divided into 22 equal width annular regions.