Definition, Meaning & Synonyms | English word ANNULUS

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Definitions of ANNULUS

1. A ring- or donut-shaped area or structure.
2. (anatomy) A ring of fibrous tissue; specifically (cardiology), such a ring around an opening of a heart valve, to which the valve leaflets and muscle fibres of the atria and ventricles are attached; an annulus fibrosus cordis.
3. (astronomy) A ring of light in a celestial body, especially when caused by an annular eclipse (for example, when the Sun and Moon are in line with the Earth, but the Moon does not completely cover the Sun's disc).
4. (biology)
5. (mathematics)
6. (technology) In a well such as an oil well or water well: the space between a pipe or tube and any pipe, tube, casing, or sides of a hole surrounding it.

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Examples of Using ANNULUS in a Sentence

• More generally, Laurent series can be used to express holomorphic functions defined on an annulus, much as power series are used to express holomorphic functions defined on a disc.
• It has a partial veil, or ring (annulus) circling the upper stalk, and the gills are "free", not attached to the stalk.
• It was given a more aerodynamic nose, four stub wings, and a box-shaped tail unit consisting of a roughly 12-sided annular set of fixed surfaces and a cruciform tail with thick surfaces within the annulus, which contained the Fritz Xs aerodynamic controls.
• The Hadamard three-circle theorem is a statement about the maximum value a holomorphic function may take inside an annulus.
• Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes with the planet gears.
• In addition to resembling the letter O and a buckeye nut, the flag's annulus also represents "the original territory of Ohio" in the Northwest Territory.
• The deep inguinal ring (internal or deep abdominal ring, abdominal inguinal ring, internal inguinal ring, annulus abdominalis) is the entrance to the inguinal canal.
• Their sporangia have a horizontal annulus that lies below and completely encircles the top of the sporangium.
• These connections are also called "annulospiral endings", deriving from the Latin word annulus which means "a ring-shaped area or structure".
• Polypodiales are unique in bearing sporangia with a vertical annulus interrupted by the stalk and stomium.
• During the removal of the pipe on Sedco 135, the dancing mud suddenly began to flow up towards the surface; by removing the drillstring the well was swabbed (an effect observed when mud must flow down the annulus to replace displaced drill pipe volume below the bit) leading to a kick.
• Members of Agaricus also have a stem or stipe, which elevates it above the object on which the mushroom grows, or substrate, and a partial veil, which protects the developing gills and later forms a ring or annulus on the stalk.
• "Floating" front end bearing consisting of an internally toothed annulus bolted to crankshaft, meshing with and incorporating a semi-floating ring, internally splined to a short coupling shaft.
• These muscles arise from the common tendinous ring (annulus of Zinn) in the orbit (eye cavity), and attach to the eyeball.
• Unlike the other extraocular muscles (recti and superior oblique), the inferior oblique muscle does not originate from the common tendinous ring (annulus of Zinn).
• In parts of West Asia, Cypraea annulus, the ring cowry, so-called because of the bright orange-colored ring on the back or upper side of the shell, was commonly used.
• The arms of Salaberry within an annulus Vert fimbriated and inscribed VOLTIGEURS DE QUEBEC in letters Argent, all surmounting the cross of the Order of St.
• Many Chinese classics refer to Bian He's jade annulus in context with other legendary gems, jades, and swords constituting the ceremonial regalia of ancient Chinese states.
• It is like Luperina testacea, but olive grey, without any rufous tinge; inner and outer lines conversely edged with whitish; a blackish shade before inner line from median vein to inner margin, interrupted at vein 1; claviform stigma broadly blackish; orbicular a minute white spot; reniform subquadrate, with fuscous centre and broad white annulus, the area beyond it blackish, submarginal line whiter, preceded, except between veins 6 and 7, by a blackish shade; a row of neat black marginal lunules; fringe dark grey pencilled with light grey; hindwing pure white, with dark marginal lunules and white fringe; the veins dark.
• The limbus of fossa ovalis (annulus ovalis) is the prominent oval margin of the fossa ovalis in the right atrium.
• The common tendinous ring, also known as the annulus of Zinn or annular tendon, is a ring of fibrous tissue surrounding the optic nerve at its entrance at the apex of the orbit.

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