Definify.com

Webster 1913 Edition

Radius

Ra′di-us

(rā′dĭ-ŭs)
,
Noun.
;
pl. L.
Radii
(rā′dĭ-ī)
; E.
Radiuses
(rā′dĭ-ŭs-ĕz)
.
[L., a staff, rod, spoke of a wheel, radius, ray. See
Ray
a divergent line.]
1.
(Geom.)
A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
2.
(Anat.)
The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of
Artiodactyla
.
☞ The radius is on the same side of the limb as the thumb, or pollex, and in man it is so articulated that its lower end is capable of partial rotation about the ulna.
3.
(Bot.)
A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See
Ray
, 2.
4.
pl.
(Zool.)
(a)
The barbs of a perfect feather.
(b)
Radiating organs, or color-markings, of the radiates.
5.
The movable limb of a sextant or other angular instrument.
Knight.
Radius bar
(Mach.)
,
a bar pivoted at one end, about which it swings, and having its other end attached to a piece which it causes to move in a circular arc.
–
Radius of curvature
.
See under
Curvature
.

Webster 1828 Edition

Radius

RA'DIUS

,
Noun.
[L. id, a ray, a rod, a beam, a spoke, that is, a shoot; radio, to shine, that is, to dart beams. See Ray.]
1.
In geometry, a right line drawn or extending from the center of a circle to the periphery, and hence the semidiameter of the circle. In trigonometry, the radius is the whole sine, or sine of 90 degrees.
2.
In anatomy, the exterior bone of the fore arm, descending along with the ulna from the elbow to the wrist.
3.
In botany, a ray; the outer part or circumference of a compound radiate flower, or radiated discous flower.

Definition 2024

Radius

Radius

See also: radius and radíus

German

Noun

Radius m ‎(genitive Radius, plural Radii or Radien)

  1. (anatomy) radius (bone)
  2. (geometry) radius (line segment)
  3. (geometry) radius (length of that line segment)

Derived terms

radius

radius

See also: Radius and radíus

English

A radius shown in red

Noun

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
  4. (geometry) A line segment between any point of a circle or sphere and its center.
  5. (geometry) The length of this line segment.

Synonyms

  • (vein of insect wing): R

Related terms

Translations

See also

Anagrams

Crimean Tatar

Etymology

Latin radius.

Noun

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

  1. radius.

Declension

References

  • Mirjejev, V. A.; Usejinov, S. M. (2002) Ukrajinsʹko-krymsʹkotatarsʹkyj slovnyk [Ukrainian – Crimean Tatar Dictionary], Simferopol: Dolya, ISBN 966-7980-89-8

Danish

Etymology

From Latin radius

Noun

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

  1. (geometry) radius

References

Esperanto

Verb

radius

  1. conditional of radii

French

Noun

radius m ‎(plural radius)

  1. (anatomy) radius

Anagrams

Latin

Etymology

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]

Pronunciation

  • (Classical) IPA(key): /ˈra.di.us/, [ˈra.di.ʊs]

Noun

radius m ‎(genitive radiī); second declension

  1. ray (of light)
  2. staff, rod
  3. spoke (of a wheel)

Inflection

Second declension.

Case Singular Plural
nominative radius radiī
genitive radiī radiōrum
dative radiō radiīs
accusative radium radiōs
ablative radiō radiīs
vocative radie radiī

Descendants

References

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

Norwegian Bokmål

Etymology

From Latin radius

Noun

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

  1. (geometry) radius

References

Norwegian Nynorsk

Etymology

From Latin radius

Noun

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

  1. (geometry) radius

References

Etymology

From Latin radius.

Pronunciation

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