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radius

From Wiktionary, the free dictionary
See also:Radius,RADIUS,andradíus

English

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The radius of a circle, shown in red

Etymology

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Borrowed fromLatinradius(ray).Doublet ofray.

Pronunciation

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Noun

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radius (pluralradiiorradiuses)

  1. (anatomy) The longbone in theforearm, on the side of thethumb.
    • 1808,John Barclay,The Muscular Motions of the Human Body[1],→OCLC, page396:
      It is also obvious, and proved by experiment, that the rotatory motions observed in the hand proceed from the rotatory motions of theradius.
  2. (zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal.
  3. (entomology) One of the major veins of the insect wing, between thesubcosta and themedia; the vein running along thecostal edge of thediscal cell.
  4. (geometry) A line segment between any point of acircle or sphere and its center.
    Fatima claims to have visited all the bars within a five-mileradius of her Manhattan apartment.
    • 1994, Viacheslav V. Nikulin, Igor R. Shafarevich, translated by Miles Reid,Geometries and Groups, Springer,page194:
      We start with spherical geometries. The two geometries on spheres ofradiuses R1 and R2 are obviously identical if R1 = R2; moreover, the converse also holds.
    • 2016, Jubee Sohn, Ho Seong Hwang, Margaret J. Geller, Antonaldo Diaferio, Kenneth J. Rines, Myung Gyoon Lee, Gwang-Ho Lee, “Compact Groups of Galaxies with Complete Spectroscopic Redshifts in the Local Universe”, inJKAS[2], volume2015:
      The velocity dispersions of early- and late-type galaxies in compact groups change little with groupcentricradius; theradii sampled are less than100 h1{\displaystyle 100~h^{-1}} kpc, smaller than theradii typically sampled by members of massive clusters of galaxies.
  5. (geometry) The length of this line segment.
    • 1998, Dieter Schuocker,Handbook of the Eurolaser Academy, Springer Science & Business Media,→ISBN, page51:
      This contribution reduces with increasing distance p from the emitting surface element dA, due to conservation of energy, as the wave energy distributed across the spherical wave front remains constant, while theradius increases during ...
  6. Anything resembling a radius, such as thespoke of awheel, the movable arm of asextant, or one of the radiating lines of a spider's web.
    • 1674,Robert Hooke,Animadversions on the Firſt Part of the Machina Coelestis of the[] Aſtronomer Johannes Hevelius[][3], page43:
      [] I can do more with a Quadrant, Sextant or Octant, of 1 footRadius, furniſhed with Teleſcopical Sights and Screws, then[sic] can poſſibly be done with any other Inſtrument, furniſhed only with Common Sights, though 10, 20, 30, nay threeſcore footRadius;[]
  7. (graph theory) Theminimumeccentricity of anyvertex, for a givengraph.

Synonyms

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  • (vein of insect wing):R

Derived terms

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Related terms

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Translations

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bone (human)
line segment
length of this line segment

Verb

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radius (third-person singular simple presentradiuses,present participleradiusing,simple past and past participleradiused)

  1. (transitive) To give a rounded edge to.
    • 2014, Anil Mital, Anoop Desai, Anand Subramanian,Product Development, page358:
      A comfortable grip is ensured by smoothing the surface of the handle andradiusing the edge.

See also

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Anagrams

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Crimean Tatar

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Other scripts
Cyrillicрадиус
Roman

Etymology

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Borrowed fromRussianрадиус(radius), fromLatinradius.

Noun

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radius

  1. radius(line segment or length of this line segment)

Declension

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Declension ofradius
singularplural
nominativeradiusradiuslar
genitiveradiusnıñradiuslarnıñ
dativeradiusqaradiuslarğa
accusativeradiusnıradiuslarnı
locativeradiustaradiuslarda
ablativeradiustanradiuslardan

References

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  • Mirjejev, V. A., Usejinov, S. M. (2002)Ukrajinsʹko-krymsʹkotatarsʹkyj slovnyk [Ukrainian – Crimean Tatar Dictionary]‎[4], Simferopol: Dolya,→ISBN
  • radius”, inLuğatçıq (in Russian)

Danish

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DanishWikipedia has an article on:
Wikipediada

Etymology

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Borrowed fromLatinradius.

Noun

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radius c (singular definiteradienorradiusen,plural indefiniteradierorradiuser)

  1. (geometry)radius

References

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Esperanto

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Verb

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radius

  1. conditional ofradii

Faroese

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Noun

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radius m (genitive singularradius, pluralradiusar)

  1. (geometry)radius

Declension

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Declension ofradius (m52)
singularplural
indefinitedefiniteindefinitedefinite
nominativeradiusradiusinradiusarradiusarnir
accusativeradiusradiusinradiusarradiusarnar
dativeradiusiradiusinumradiusumradiusunum
genitiveradiusradiussinsradiusaradiusanna

French

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Etymology

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Borrowed fromLatinradius.Doublet ofrai, which was inherited.

Pronunciation

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Noun

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radius m (pluralradius)

  1. (anatomy)radius

Further reading

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Anagrams

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Ido

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Verb

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radius

  1. conditional ofradiar

Indonesian

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IndonesianWikipedia has an article on:
Wikipediaid

Etymology

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Learned borrowing fromLatinradius.

Pronunciation

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  • IPA(key):/raˈdiʊs/
  • Hyphenation:ra‧di‧us

Noun

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radius (pluralradius-radius)

  1. radius:
    1. (mathematics) a line segment between any point of a circle or sphere and its center; the length of this line segment
      Synonym:jari-jari
    2. (anatomy) the long bone in the forearm, on the side of the thumb
      Synonym:pengumpil
  2. area of acircle, commonly withepicenter ascenter

Derived terms

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Further reading

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Latin

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Etymology

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Of uncertain origin.[1] Some connect it withrādīx andrāmus. Tucker suggestsProto-Indo-European*neredʰ-(extend forth, rise, outward) akin to Sanskritवर्धते(vardhate,rise, grow), or fromAncient Greekἄρδις(árdis,sharp point).[2] May ultimately be fromProto-Indo-European*reh₁t-(bar, beam, stem).

Pronunciation

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Noun

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radius m (genitiveradiīorradī);second declension

  1. astaff,rod
    1. aspoke of awheel
    2. a rod for measurement
    3. theradius of acircle; a rotatingradialarm
    4. (weaving) ashuttle
    5. (poetic) abolt orshaft
    6. thespur of abird'sleg
    7. the tail-spine of astingray
    8. (anatomy) theradius(the outer bone of aforearm)
  2. aray oflight(also reflected)
    • 29BCE – 19BCE,Virgil,Aeneid4.118-119:
      “[...] ubi prīmōs crāstinus ortus
      extulerit Tītān,radiīsque retēxerit orbem.”
      “[...] when at tomorrow’s early dawn the Titan [Sun] will have risen, andwith [his] rays revealed the world.”
    • 8CE,Ovid,Fasti6.717:
      At pater Hēliadumradiōs ubi tīnxerit undīs
      But when the father of the Heliades shall have dipped hisrays in the waves [...].
      (The father is the sun god; see:Heliades.)
    1. (according to an ancient theory of vision) a ray extending from the eye to the object seen
  3. the name of anelongated variety ofolive
  4. the name of a rod with which geometers make figures in dust, also known as avirga

Declension

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Second-declension noun.

singularplural
nominativeradiusradiī
genitiveradiī
radī1
radiōrum
dativeradiōradiīs
accusativeradiumradiōs
ablativeradiōradiīs
vocativeradieradiī

1Found in older Latin (until the Augustan Age).

Derived terms

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Descendants

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Learned borrowings

References

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  1. ^De Vaan, Michiel (2008) “radius”, inEtymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill,→ISBN,page512
  2. ^ Tucker, T.G., Etymological Dictionary of Latin, Ares Publishers, 1976 (reprint of 1931 edition).

Further reading

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  • radius” on page 1731 of theOxford Latin Dictionary (2nd ed., 2012)
  • radius”, inCharlton T. Lewis and Charles Short (1879)A Latin Dictionary, Oxford: Clarendon Press
  • radius”, inCharlton T. Lewis (1891)An Elementary Latin Dictionary, New York: Harper & Brothers
  • "radius", in Charles du Fresne du Cange’sGlossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
  • radius inGaffiot, Félix (1934)Dictionnaire illustré latin-français, Hachette.
  • radius”, inHarry Thurston Peck, editor (1898),Harper’s Dictionary of Classical Antiquities, New York: Harper & Brothers
  • radius”, inWilliam Smith et al., editor (1890),A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin

Norwegian Bokmål

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NorwegianWikipedia has an article on:
Wikipediano

Etymology

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Borrowed fromLatinradius.

Noun

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radius m (definite singularradienorradiusen,indefinite pluralradier,definite pluralradiene)

  1. (geometry)radius

References

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Norwegian Nynorsk

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Norwegian NynorskWikipedia has an article on:
Wikipediann

Etymology

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Borrowed fromLatinradius.

Noun

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radius m (definite singularradiusen,indefinite pluralradiusar,definite pluralradiusane)

  1. (geometry)radius

References

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Romanian

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Etymology

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Borrowed fromFrenchradius,Latinradius. Compare the inherited doubletrază(ray).

Noun

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radius n (pluralradiusuri)

  1. (anatomy)radius (bone)

Related terms

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