radius

Definition from Wiktionary, the free dictionary
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See also: Radius, RADIUS, and radíus

English[edit]

The radius of a circle, shown in red

Etymology[edit]

Borrowed from Latin radius (ray). Doublet of ray.

Pronunciation[edit]

  • enPR: rā'-dē-əs, IPA(key): /ˈɹeɪ.di.əs/
  • (file)
  • Rhymes: -eɪdiəs
  • Hyphenation: ra‧di‧us

Noun[edit]

radius (plural radii or radiuses)

  1. (anatomy) The long bone in the forearm, on the side of the thumb.
  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 the subcosta and the media; the vein running along the costal edge of the discal cell.
  4. (geometry) A line segment between any point of a circle or sphere and its center.
  5. (geometry) The length of this line segment.
  6. Anything resembling a radius, such as the spoke of a wheel, the movable arm of a sextant, or one of the radiating lines of a spider's web.

Synonyms[edit]

  • (vein of insect wing): R

Derived terms[edit]

Related terms[edit]

Translations[edit]

See also[edit]

Anagrams[edit]


Crimean Tatar[edit]

Etymology[edit]

Borrowed from Latin radius.

Noun[edit]

radius

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

Declension[edit]

References[edit]

  • Mirjejev, V. A.; Usejinov, S. M. (2002) Ukrajinsʹko-krymsʹkotatarsʹkyj slovnyk [Ukrainian – Crimean Tatar Dictionary]‎[1], Simferopol: Dolya, →ISBN

Danish[edit]

Danish Wikipedia has an article on:
Wikipedia da

Etymology[edit]

Borrowed from Latin radius.

Noun[edit]

radius c (singular definite radien or radiusen, plural indefinite radier or radiuser)

  1. (geometry) radius

References[edit]


Esperanto[edit]

Verb[edit]

radius

  1. conditional of radii

Faroese[edit]

Noun[edit]

radius m (genitive singular radius, plural radiusar)

  1. (geometry) radius

Declension[edit]

Template:fo-decl-noun-m52


French[edit]

Etymology[edit]

Borrowed from Latin radius. Doublet of rai, which was inherited.

Pronunciation[edit]

Noun[edit]

radius m (plural radius)

  1. (anatomy) radius

Further reading[edit]

Anagrams[edit]


Ido[edit]

Verb[edit]

radius

  1. conditional of radiar

Latin[edit]

Etymology[edit]

Of uncertain origin. Some have tried to connect it to rādīx. Tucker suggests Proto-Indo-European *neredʰ- (extend forth, rise, outward) akin to Sanskrit वर्धते (vardhate, rise, grow), or from Ancient Greek ἄρδις (árdis, sharp point).[1] May ultimately be from Proto-Indo-European *reh₁t- (bar, beam, stem).

Pronunciation[edit]

Noun[edit]

radius m (genitive radiī or radī); second declension

  1. a ray of light (also reflected)
    1. (according to an ancient theory of vision) a ray extending from the eye to the object seen
  2. a spoke of a wheel
    1. the radius of a circle; a rotating radial arm
  3. a pointed rod (used for drawing diagrams etc.)
    1. (weaving) a shuttle
    2. (poetic) a bolt or shaft
    3. the spur of a bird's leg
    4. the tail-spine of a stingray
    5. (anatomy) the radius (the outer bone of a forearm)
  4. the name of an elongated variety of olive

Declension[edit]

Second-declension noun.

Case Singular Plural
Nominative radius radiī
Genitive radiī
radī1
radiōrum
Dative radiō radiīs
Accusative radium radiōs
Ablative radiō radiīs
Vocative radie radiī

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

Derived terms[edit]

Descendants[edit]

Learned borrowings[edit]

References[edit]

  1. ^ Tucker, T.G., Etymological Dictionary of Latin, Ares Publishers, 1976 (reprint of 1931 edition).

Further reading[edit]

  • radius in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • radius in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • radius in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • radius in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
  • radius in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • radius in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin

Norwegian Bokmål[edit]

Norwegian Wikipedia has an article on:
Wikipedia no

Etymology[edit]

Borrowed from Latin radius.

Noun[edit]

radius m (definite singular radien or radiusen, indefinite plural radier, definite plural radiene)

  1. (geometry) radius

References[edit]


Norwegian Nynorsk[edit]

Norwegian Nynorsk Wikipedia has an article on:
Wikipedia nn

Etymology[edit]

Borrowed from Latin radius.

Noun[edit]

radius m (definite singular radiusen, indefinite plural radiusar, definite plural radiusane)

  1. (geometry) radius

References[edit]


Romanian[edit]

Etymology[edit]

Borrowed from French radius, Latin radius. Compare the inherited doublet rază (ray).

Noun[edit]

radius n (plural radiusuri)

  1. (anatomy) radius (bone)

Related terms[edit]