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annulus

n. 环,轮,体环

环,轮,体环

WordNet (r) 3.0 (2006) (WordNet)

annulus
n 1: a toroidal shape; "a ring of ships in the harbor"; "a halo
of smoke" [synonym: {ring}, {halo}, {annulus}, {doughnut},
{anchor ring}]
2: (Fungi) a remnant of the partial veil that in mature
mushrooms surrounds the stem like a collar [synonym: {annulus},
{skirt}]

The Collaborative International Dictionary of English v.0.48 (gcide)

Annulus \An"nu*lus\, n.; pl. {Annuli}. [L.]
1. A ring; a ringlike part or space.
[1913 Webster]

2. (Geom.)
(a) A space contained between the circumferences of two
circles, one within the other.
(b) The solid formed by a circle revolving around a line
which is the plane of the circle but does not cut it.
[1913 Webster]

3. (Zool.) Ring-shaped structures or markings, found in, or
upon, various animals.
[1913 Webster]

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Annulus (mathematics) - Wikipedia
In mathematics, an annulus (pl : annuli or annuluses) is the region between two concentric circles Informally, it is shaped like a ring or a hardware washer The word "annulus" is borrowed from the Latin word anulus or annulus meaning 'little ring' The adjectival form is annular (as in annular eclipse)
ANNULUS Definition Meaning | Dictionary. com
ANNULUS definition: a ring; a ringlike part, band, or space See examples of annulus used in a sentence
Annulus - Definition, Formula, Examples - Cuemath
An annulus is a two-dimensional flat figure shaped in a circular form which is constructed by two concentric circles The region or the area formed in between these two concentric circles is called the annulus
Annulus - Definition, Formula, Examples - Math Monks
An annulus is a flat, ring-shaped structure made out of 2 circles Another way of looking at it is a circular ring with a circular hole in it Mathematically, it is the area between the 2 circles having a common center (concentric circles) lying in the same plane Annulus is expressed in square units such as m 2, cm 2, in 2, and ft 2
ANNULUS Definition Meaning - Merriam-Webster
The meaning of ANNULUS is ring
Understanding Annulus in Geometry - A Comprehensive Guide
The annulus is a geometric shape that refers to the region between two concentric circles It is described as the collection of all points in a plane inside and outside the outer circle
Tympanic annulus | anatomy | Britannica
It is directed downward and inward from the tympanic cavity, or middle ear, to the portion of the pharynx called the nasopharynx (the space above the soft palate and behind and continuous with the nasal passages) The upper end of the eustachian tube is narrow and surrounded by bone
Annulus - GeeksforGeeks
The term 'annulus' comes from the Latin word annuli, meaning 'little ring ' An annulus is a flat, plane figure formed between two concentric circles, creating a ring-like shape
Annulus Area Formula - GeeksforGeeks
The common area between the two circles is known as the annulus region, and the formula used to find that area is known as the annulus formula It can also be termed as a circle with a hole in the center of radius r
Annulus -- from Wolfram MathWorld
An annulus is a region lying between two concentric circles The area of the annulus formed by two circles of radii a and b (with a>b) is A_ (annulus)=pi (a^2-b^2)

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