annulus

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an·nu·lus

 (ăn′yə-ləs)
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.
2.
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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

annulus

(ˈænjʊləs)
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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

an•nu•lus

(ˈæn yə ləs)

n., pl. -li (-ˌlaɪ)
-lus•es.
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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
annulusz

annulus

[ˈænjʊləs] n (annules or annuli (pl)) [ˈænjʊˌlaɪ]corona circolare
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in periodicals archive ?
In addition to the intervention of the main wellbore, Expro now has the ability to enter and intervene the annuli.
In addition, fMRI revealed ADC values of corresponding areas in nuclei pulposi and annuli fibrosi of the same segment of intervertebral discs in four groups of SD rats to also decrease as the rats aged.
So this paper is focused on finding new theorems that can provide smaller annuli containing all the zeros of a polynomial.
Age of sheepshead was estimated by counting annuli (opaque zones) in thin-sectioned sagittal otoliths.
Maximum von Mises Equivalent Stresses in the Annuli. The four 50% unilateral facetectomy procedures only resulted in slightly different results for maximum von Mises stress in the annuli in comparison to the intact model.
In most elasmobranch studies, sagittally sectioned vertebrae are selected as the primary age structure (Cailliet and Goldman, 2004), although clarity of annuli within vertebrae is largely species-specific.
Annuli have the shape of rounded symmetrical curves in longitudinal section.
The youngest clams in New Jersey and Delmarva formed annuli about a month earlier than the older age classes.
The area A can be obtained via calculus by dividing the annulus up into an infinite number of annuli of infinitesimal width d[chi] and area 2[pi][chi]d[chi] and then integrating from [chi] = [R.sup.1.sub.i] to [chi] = [R.sup.L.sub.0]; that is; [mathematical expression not reproducible].
This genus is recognized by females' head swollen but without a neck, annuli obvious in nymphs but not in adults, oval or keyshaped mouth in the line of the inner hooks and by internal hooks simple and external hooks double in both, nymphs and adults (Riley and Self, 1979).