annulus

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Related to annular ring: annulus

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 ?
This will improve annular ring at the transition where it is most critical.
The geometry of the annular ring slot antenna is shown in Figure 1.
This article describes the design and testing of rectangular and annular ring printed aperture antennas with stripline feeds.
In order to solve this problem, a stacked parasitic patch above the annular ring is used.
Since the partial annular ring slot and vertical rectangular slot are the main factor in achieving band notched characteristics, there parameters [t.
NGC 6369, the Little Ghost in Ophiuchus (shown on page 70 and charted on page 56 of the Pocket Sky Atlas), is less ambiguous still, a clearly annular ring.
If a trace, knee or annular ring is eroded, there's no fixing it.
One of the most vulnerable locations on the PCB to be affected by copper dissolution is the trace that connects to the annular ring.
If the whole floor is faulty, it's better to layin plywood, nailed down with annular ring shank nails.
Due to variation in the pad centers' location on various layers and variation in drilled hole location, pads that are considerably larger than the drilled holes need to be generated and sized to account for deviation in pad location resulting from processing, minimum annular ring specifications and the hole diameter.
One insert is placed adjacent to the centerline and carves out an annular ring with a very small ID.