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Words, grammatical forms and meanings linked to the ontology.

annulus en · NOUN

Pronunciation

  • /ˈænjəlaɪ/ (General-American)
  • /-li/ (Received-Pronunciation)
  • /ˈænjʊləs/ (Received-Pronunciation)
  • /ˈænjələs/ (General-American)
  • /-li/ (General-American)
  • /ˈænjʊlaɪ/ (Received-Pronunciation)
  • (US) audio

Etymology

Learned borrowing from Medieval Latin ānnulus, a misspelling of Latin ānulus (“ring, especially one worn on a finger”), from ānus (“ring”) (possibly from Proto-Indo-European *h₁eh₂-n-o- (“ring”), from an uncertain root) + -ulus (diminutive suffix). The plural form annuli is a learned borrowing from Medieval Latin ānnulī.

Meanings

  1. A ring- or donut-shaped area, object, or structure.
    • But by the knots I am ſpeaking of, may it pleaſe your reverences to believe, that I mean good, honeſt, deviliſh tight, hard knots, made bona fide, as Obadiah made his;—in vvhich there is no quibbling proviſion made by the duplication and return of the tvvo ends of the ſtrings through the annulus or nooſe made by the ſecond implication of them— […] 1761, [Laurence Sterne], chapter IX, in The Life and Opinions of Tristram Shandy, Gentleman, volume III, London: […] R[obert] and J[ames] Dodsley […], →OCLC, pages 29–30:
  2. 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. 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. A structure surrounding a sporangium (or part of it) which shrinks and causes it to rupture for spore dispersal; specifically, in a fern: a structure around about two-thirds of the sporangium consisting of differentially thick-walled cells which dry and distort the sporangium; and in a moss: a complete ring of cells around the tip of the sporangium which dissolves to cause the tip to detach.
  5. The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
  6. A dark ring on a fish's scale that is formed when a fish's growth rate slows down in the winter due to low food intake and the scale's circuli move closer to one another. The dark ring is used to estimate the fish's age, approximately one year per annulus.
  7. The region in a plane between two concentric circles of different radii.
  8. Any topological space homeomorphic to the region in a plane between two concentric circles of different radii.
  9. 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.
    • Pressure balance is obtained by the air pressure in the cylinder operating on a supplementary piston in the buffer piston head, transmitting pressure to a small quantity of oil which is ported to an annulus between the buffer piston seals and the cylinder wall, so that the seal is always under opposing pressures; oil on one side and air on the other. 1950 September, “Notes and News: Pneumatic Buffer Stop, E.R.”, in The Railway Magazine, London: Tothill Press, →ISSN, →OCLC, page 642:

Forms

SpellingFeaturesLabelsSource
annuluses Number=Plur lexicographic
annuli Number=Plur lexicographic

Coordinates

focus · circulus

Deriveds

single annulus · apical annulus · annulus fibrosus · annulotomy · square annulus · attached annulus · annulus of Zinn · periannulus · pseudannulus · double annulus

Hyponyms

torus

Relateds

triannulated · annulated · annularly · annulation · annularity · exannulate · annulet · quadriannulate · annule · annulary · mitral annulus · triannulate · annulate · annular · sexannulate

Synonyms

cylinder

Translations (87)

pt anel (remnants of a partial veil which leaves a ring on the stem of a mushroom) · uk кільце́ (region in a plane between two concentric circles of different radii) · fr anneau (ring- or donut-shaped area or structure) · fi rengasmainen väli (in a well: the space between a pipe or tube and any pipe, tube, casing, or sides of a hole surrounding it) · fi rengasvyöhyke (remnants of a partial veil which leaves a ring on the stem of a mushroom) · it anello (region in a plane between two concentric circles of different radii) · it anello (ring- or donut-shaped area or structure) · et rõngas (region in a plane between two concentric circles of different radii) · gl anel (remnants of a partial veil which leaves a ring on the stem of a mushroom) · co anellu (ring- or donut-shaped area or structure) · it corona circolare (region in a plane between two concentric circles of different radii) · ga fáinne (ring- or donut-shaped area or structure) · eo ringo (region in a plane between two concentric circles of different radii) · cv ункӑ (region in a plane between two concentric circles of different radii) · es corona circular (region in a plane between two concentric circles of different radii) · fi rengasalue (topological space homeomorphic to the region in a plane between two concentric circles of different radii) · ro coroană solară (ring of light in a celestial body, especially when caused by an annular eclipse) · bn চাকতি (region in a plane between two concentric circles of different radii) · nl annulus (remnants of a partial veil which leaves a ring on the stem of a mushroom) · cmn 環空 /环空 (in a well: the space between a pipe or tube and any pipe, tube, casing, or sides of a hole surrounding it) · ca corona circular (region in a plane between two concentric circles of different radii) · da annulus (in a well: the space between a pipe or tube and any pipe, tube, casing, or sides of a hole surrounding it) · ca anell (ring- or donut-shaped area or structure) · nv ahééjiichįįʼ (ring of light in a celestial body, especially when caused by an annular eclipse) · fr anneau (remnants of a partial veil which leaves a ring on the stem of a mushroom) · an aniello (ring- or donut-shaped area or structure) · ro coroană de cerc (region in a plane between two concentric circles of different radii) · de Annulus (remnants of a partial veil which leaves a ring on the stem of a mushroom) · fi rengas (structure surrounding a sporangium (or part of it) which shrinks and causes it to rupture for seed dispersal) · pt annulus (structure surrounding a sporangium (or part of it) which shrinks and causes it to rupture for seed dispersal) · fa حلقه قارچ (remnants of a partial veil which leaves a ring on the stem of a mushroom) · mk пр́стен (ring- or donut-shaped area or structure) · sl kolobar (region in a plane between two concentric circles of different radii) · fr couronne (region in a plane between two concentric circles of different radii) · es arandela (region in a plane between two concentric circles of different radii) · fi rinkilä (ring- or donut-shaped area or structure) · de Kreisring (region in a plane between two concentric circles of different radii) · cmn 蕈環 /蕈环 (remnants of a partial veil which leaves a ring on the stem of a mushroom) · pt coroa circular (region in a plane between two concentric circles of different radii) · ja アニュラス (region in a plane between two concentric circles of different radii) · ro coroană circulară (region in a plane between two concentric circles of different radii) · de Ring (ring- or donut-shaped area or structure) · ru коле́чко (ring- or donut-shaped area or structure) · gl anel (ring- or donut-shaped area or structure) · hy օղակ (region in a plane between two concentric circles of different radii) · cs mezikruží (region in a plane between two concentric circles of different radii) · pl pierścień kołowy (region in a plane between two concentric circles of different radii) · ast aniellu (ring- or donut-shaped area or structure) · da annulus (region in a plane between two concentric circles of different radii) · ru кольцо́ (ring- or donut-shaped area or structure) · ca anell (remnants of a partial veil which leaves a ring on the stem of a mushroom) · ta வட்டவலையம் (region in a plane between two concentric circles of different radii) · fi annulus (region in a plane between two concentric circles of different radii) · vi hình vành khăn (region in a plane between two concentric circles of different radii) · ga annalas (ring- or donut-shaped area or structure) · ro inel (ring- or donut-shaped area or structure) · he טַבַּעַת (region in a plane between two concentric circles of different radii) · es annulus (region in a plane between two concentric circles of different radii) · cmn 環形 /环形 (region in a plane between two concentric circles of different radii) · fi välitila (in a well: the space between a pipe or tube and any pipe, tube, casing, or sides of a hole surrounding it) · pt anel (ring- or donut-shaped area or structure) · hu annulusz (structure surrounding a sporangium (or part of it) which shrinks and causes it to rupture for seed dispersal) · id anulus (region in a plane between two concentric circles of different radii) · fi rengas (remnants of a partial veil which leaves a ring on the stem of a mushroom) · eu koroa zirkular (region in a plane between two concentric circles of different radii) · ar حَلَقَة (remnants of a partial veil which leaves a ring on the stem of a mushroom) · es anillo (remnants of a partial veil which leaves a ring on the stem of a mushroom) · es anillo (ring- or donut-shaped area or structure) · la anulus (ring- or donut-shaped area or structure) · sv cirkelring (region in a plane between two concentric circles of different radii) · fi annulus (topological space homeomorphic to the region in a plane between two concentric circles of different radii) · fr anneau (ring of light in a celestial body, especially when caused by an annular eclipse) · ms anulus (ring- or donut-shaped area or structure) · nl cirkelring (region in a plane between two concentric circles of different radii) · it anello (remnants of a partial veil which leaves a ring on the stem of a mushroom) · es corona solar (ring of light in a celestial body, especially when caused by an annular eclipse) · fi kehä (ring- or donut-shaped area or structure) · fi rengasalue (region in a plane between two concentric circles of different radii) · lv gredzens (region in a plane between two concentric circles of different radii) · fi annulus (remnants of a partial veil which leaves a ring on the stem of a mushroom) · ar حَلْقَة (remnants of a partial veil which leaves a ring on the stem of a mushroom) · fi annulus (structure surrounding a sporangium (or part of it) which shrinks and causes it to rupture for seed dispersal) · fi rengas (ring of light in a celestial body, especially when caused by an annular eclipse) · fi rengas (ring of fibrous tissue; specifically, such a ring around an opening of a heart valve) · hu körgyűrű (region in a plane between two concentric circles of different radii) · ru кольцо́ (region in a plane between two concentric circles of different radii) · vec aneło (remnants of a partial veil which leaves a ring on the stem of a mushroom)