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n. pl. an·nu·lus·es or an·nu·li (-lī′)
1. A ringlike figure, part, structure, or marking, such as a growth ring on the scale of a fish.
a. A ring or group of thick-walled cells around the sporangia of many ferns that functions in spore release.
b. The ringlike remains of a broken partial veil, found around the stipes of certain mushrooms.
3. Mathematics The figure bounded by and containing the area between two concentric circles.

[Latin ānulus, ring, diminutive of ānus.]


n, pl -li (-ˌlaɪ) or -luses
1. (Mathematics) the area between two concentric circles
2. a ring-shaped part, figure, or space
[C16: from Latin, variant of ānulus ring]


(ˈæn yə ləs)

n., pl. -li (-ˌlaɪ)
1. a ringlike part, band, or space; ring.
2. the space between two concentric circles on a plane.
3. the veil remnant on a mushroom stalk.
4. a growth ring, as the annual ring of a tree trunk, that can be used to estimate age.
[1555–65; < Latin, variant of ānulus=ān(us) ring + -ulus -ule]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.annulus - a toroidal shapeannulus - a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
fairy circle, fairy ring - a ring of fungi marking the periphery of the perennial underground growth of the mycelium
toroid - the doughnut-shaped object enclosed by a torus
2.annulus - (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collarannulus - (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar
Fungi, fungus kingdom, kingdom Fungi - the taxonomic kingdom including yeast, molds, smuts, mushrooms, and toadstools; distinct from the green plants
plant part, plant structure - any part of a plant or fungus
partial veil - membrane of the young sporophore of various mushrooms extending from the margin of the cap to the stem and is ruptured by growth; represented in mature mushroom by an annulus around the stem and sometimes a cortina on the margin of the cap


[ˈænjʊləs] n (annules or annuli (pl)) [ˈænjʊˌlaɪ]corona circolare
References in periodicals archive ?
Hole-to-pad size relationships continue to shrink, robbing annular ring.
You could try cleaning the boards with white spirit and steel wool but I would line the floor with hardboard (not to be confused with MDF) and fix with annular ring nails, spaced the width of your hand apart.
Use annular ring nails to fix to the floor with the nails spaced at about the width of your hand.
Yang, "Integrated compact circular polarization annular ring slot antenna design for RFID reader," Progress In Electromagnetics Research Letters, Vol.
Annular ring slot antennas are widely used as the installation to an aircraft since they have the advantages of simple structure, low profile, and omni-directional azimuth radiation pattern.
This study examines the withdrawal load and energy capacity of three types of nail fasteners that are commonly used to attach sheathing to framing members: 8d common, annular ring shank, and helical shank.
Parron, "Concentric annular ring slot antenna for global navigation satellite systems," IEEE Antennas and Wireless Propag.
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.
25" and the two ends were joined using a glue to form an annular ring.
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.