annulus

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annulus

 [an´u-lus] (pl. an´nuli) (L.)
alternate spelling of anulus.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

annulus

(ăn′yə-ləs)
n. pl. annu·luses or annu·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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

annulus

Any ring-like structure (e.g., mitral valve annulus).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

annulus

Any ring-like structure.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

annulus

  1. the ring of cells in the moss or fern capsule which splits to allow the liberation of spores.
  2. a ring of tissue surrounding the stalk in the fruiting bodies of the BASIDIOMYCOTA fungi.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
The ground and the BHE are divided into m slices along the borehole axis; each slice is then divided into n annular regions at different distances from the axis of the borehole.
In the CaRM, 20 slices 5 m (16.4 ft) deep were considered; the maximum radius ([r.sub.max], where the undisturbed ground temperature is applied) was set to 3.5 m (11.5 ft), split into 20 annular regions from the axis of the borehole with an expansion factor of 1.2.
They were nearly all in annular regions 3, 4, or 5, and in either the frond pile or between-zone areas.
To calculate throughfall, the catch in the drums in each of the annular regions was taken to represent throughfall there.
Consequently, for a given compounding cylinder geometry, the material throughput of the apex and annular regions can be calculated.
It is well documented that flow through a capillary can produce a depleted layer of particles near the walls [8] as well as depleted annular regions [9].