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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Some LDI users have been able to show capabilities down to 25-[mu]m outerlayer annular rings for microvias, without annular ring breakout when the imaging is registered and scaled to the laser-drilled microvias.
Often in the case of annular ring, the design does not support meeting Class 3 annular ring, and there is no room to increase pad size and no practical means to reduce hole size, either due to bit size availability or, in some cases, because the through-hole aspect ratio may go too high, causing other risks.
In recent years, many annular ring slot antennas have been developed for dual-frequency operations [1-13], and several of methods have been used to create antenna with dual-band characteristic.
There is no barrel bushing since the barrel has an annular ring at its muzzle.
According to Krechetnikov, ideas from liquid sloshing engineering studies, which historically were done to stabilize fuel tanks inside missiles, indicate three possibilities for spill-free cup designs - "a flexible container to act as a sloshing absorber in suppressing liquid oscillations, a series of annular ring baffles arranged around the inner wall of the container to achieve sloshing suppression, or a different shape cup."
This results in a thick annular ring of sunlight surrounding the Moon at mid-eclipse and a rather broad path within which annularity is visible, ranging from 147 to 201 miles (237 to 323 km) in width.
Soft foam of a 1" x 4" cross-section was cut to a length of 7'3.25" and the two ends were joined using a glue to form an annular ring. Eight such TireSilencer rings were made for testing on vehicles.
Annular ring microstrip antennas, because of their flexibility for producing dual frequency treatment [16] and advantages for using in medical applications [15] are interesting to many researchers.
An inner annular ring on the nipple rests against the inside surface of the bottle neck, allowing air to flow into the bottle but preventing fluid from leaking out.