annulus

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Related to annulus: Annulus fibrosus, Annulus of Zinn

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.

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]

ThesaurusAntonymsRelated WordsSynonymsLegend:

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Noun	1.	annulus - a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke" anchor ring, doughnut, halo, ring 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 collar skirt 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

Translations

anillo

tore

annulusz

annulus

[ˈænjʊləs] n (annules or annuli (pl)) [ˈænjʊˌlaɪ] → corona circolare

Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

References in periodicals archive ?

Research gathered by Expro suggests 19% of the world's gas wells suffer from a degree of leakage while a common location for a well leak (loss of barrier) can typically be found in the annulus between the casing strings.

Blending innovation benefits to drive down intervention costs; INFRASTRUCTURE

The maximum stresses on the annulus fibrosus at the upper adjacent level ranged from 0.21 to 0.57 MPa (mean [+ or -] SD: 0.28 [+ or -]0.11 MPa).

A biomechanical study on proximal junctional kyphosis following long-segment posterior spinal fusion

Designed with an artificial viscoelastic nucleus and fiber annulus that mimics the anatomic structure of a natural disc, the M6-C device is the only artificial cervical disc available in the U.S.

Orthofix announces first U.S. patient implants of M6-C artificial cervical disc

The incision was continued across the stenotic part in case of a proximal narrowing when the incision was made through the pulmonary valvular annulus, an attempt was made to preserve the cusp by making the incision through the cusp.

PRESERVATION OF PULMONARY VALVE THROUGH TRANSATRIAL AND TRANSVENTRICULAR APPROACH IN PRIMARY REPAIR OF TETRALOGY OF FALLOT (TOF); A SINGLE CENTERED RETROSPECTIVE ANALYSIS

It is used for high-risk patients with functional mitral regurgitation, a disease that causes the heart's left ventricle to become enlarged and the valve opening, or annulus, to stretch.

Three high-risk Emiratis undergo advanced heart valve repair procedure

This large and currently underserved patient population could benefit from a fully-percutaneous transcatheter procedure that can repair the dilated mitral annulus and reduce regurgitation without undergoing surgery.

Boston Scientific Enters Option Agreement with Medical Device Maker Millipede

Nucleus pulposus and annulus fibrosus regions were identified, several regions of interest were chosen, and their ADC values were obtained.

Diffusion-weighted 7.0T Magnetic Resonance Imaging in Assessment of Intervertebral Disc Degeneration in Rats

Approximations to the zeros of a polynomial can be drawn by these methods, and these methods can become more efficient when an annulus containing all the zeros of the polynomial is provided.

Annular Bounds for the Zeros of a Polynomial

Of note, the mitral annulus also appeared rather echogenic.

A Case of Cardiac Calcified Amorphous Tumor Presenting with Concomitant ST-Elevation Myocardial Infarction and Occipital Stroke and a Brief Review of the Literature

"The Research and Development team at TUV Rheinland has developed a new tool that fits and enters the annulus between the surface casing and the intermediate casing," remarked Fred Gabriels, the managing director at TUV Rheinland.