Dictionary

radius en · NOUN

Pronunciation

• /ˈɹeɪ.di.əs/
• (US) audio
• rā'-dē-əs

Etymology

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

Meanings

1. The long bone in the forearm, on the side of the thumb.
   • It is also obvious, and proved by experiment, that the rotatory motions observed in the hand proceed from the rotatory motions of the radius. 1808, John Barclay, The Muscular Motions of the Human Body, →OCLC, page 396:
2. The lighter bone (or fused portion of bone) in the forelimb of an animal.
3. 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. A line segment between any point of a circle or sphere and its center.
   • We start with spherical geometries. The two geometries on spheres of radiuses R₁ and R₂ are obviously identical if R₁ = R₂; moreover, the converse also holds. 1994, Viacheslav V. Nikulin, Igor R. Shafarevich, translated by Miles Reid, Geometries and Groups, Springer, page 194:
   • The velocity dispersions of early- and late-type galaxies in compact groups change little with groupcentric radius; the radii sampled are less than 100~h#123;-1#125; kpc, smaller than the radii typically sampled by members of massive clusters of galaxies. 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”, in JKAS, volume 2015:
   • Fatima claims to have visited all the bars within a five-mile radius of her Manhattan apartment.
5. The length of this line segment.
   • 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 the radius increases during ... 1998, Dieter Schuocker, Handbook of the Eurolaser Academy, Springer Science & Business Media, →ISBN, page 51:
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.
   • […] I can do more with a Quadrant, Sextant or Octant, of 1 foot Radius, 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 foot Radius; […] 1674, Robert Hooke, Animadversions on the Firſt Part of the Machina Coelestis of the […] Aſtronomer Johannes Hevelius […] , page 43:
7. The minimum eccentricity of any vertex, for a given graph.

Forms

Deriveds

blast radius · hyperradius · Debye radius · gyradius · radion · covalent radius · Earth radius · Einstein radius · Bohr radius · circumradius · interradius · radius bar · radius vector · ionic radius · radian · Schwarzschild radius · metallic radius · equiradiate · distal radius · radius rod · gyroradius · triradius · radius of gyration · Roche radius · van der Waals radius · Hill radius · sight radius · hydraulic radius · radius of action · radius arm · radius of convergence · atomic radius · radius of curvature · inradius · exradius · potato radius

Relateds

radiate · radiad · radiation · radial

Synonyms

R (vein of insect wing)

Translations (160)

he רַדְיוּס (line segment) · ka რადიუსი (line segment) · tr döner kemik (bone (human)) · lt spindulys (line segment) · io radiuso (line segment) · it raggio (length of this line segment) · lv rādiuss (line segment) · de Radius (bone (human)) · gl raio (line segment) · kmr nîvtîre (line segment) · ru ра́диус (length of this line segment) · it raggio (line segment) · pl kość promieniowa (bone (human)) · kk кәрі жілік (bone (human)) · nl straal (length of this line segment) · ca radi (line segment) · az radius (line segment) · bg ра́диус (length of this line segment) · fi säde (length of this line segment) · ro rază (length of this line segment) · mk радиус (length of this line segment) · nl spaakbeen (bone (human)) · be ра́дыус (line segment) · ko 반지름 (length of this line segment) · cy radiws (length of this line segment) · de Halbmesser (line segment) · ga ga (length of this line segment) · hy ճաճանչոսկր (bone (human)) · pt raio (line segment) · nn radius (line segment) · kn ಮುಂಗೈ ಮೂಳೆ (bone (human)) · te రత్ని (bone (human)) · fr rayon (length of this line segment) · af radius (line segment) · hu sugár (length of this line segment) · vo raid (line segment) · fa زند زبرین (bone (human)) · kn ತ್ರಿಜ್ಯ (line segment) · ms jejari (line segment) · de Halbmesser (length of this line segment) · kmr kewere (bone (human)) · ko 노뼈 (bone (human)) · mr त्रिज्या (line segment) · is geisli (length of this line segment) · sk polomer (line segment) · is geisli (line segment) · sh полупречник (length of this line segment) · is radíus (length of this line segment) · fur rai (line segment) · pa ਰੇਡੀਅਸ (line segment) · pl promień (line segment) · mk радиус (line segment) · cy radiws (line segment) · mi āpiti (bone (human)) · ms radius (bone (human)) · ca radi (bone (human)) · it radio (bone (human)) · gd spòg (line segment) · cmn 半徑 /半径 (length of this line segment) · ur رداس (line segment) · sl polmer (line segment) · br skin (line segment) · ru ра́диус (line segment) · es radio (bone (human)) · bg ра́диус (line segment) · ga gaghéag (bone (human)) · el ακτίνα (line segment) · hy շառավիղ (line segment) · el κερκίδα (bone (human)) · ca radi (length of this line segment) · pt rádio (bone (human)) · de Radius (length of this line segment) · nl straal (line segment) · be ра́дыус (length of this line segment) · ko 반지름 (line segment) · ro rază (line segment) · is radíus (line segment) · sh žbica (bone (human)) · ja 半径 (length of this line segment) · uk променева кістка (bone (human)) · sh polumjer (length of this line segment) · sh полупречник (line segment) · de Speiche (bone (human)) · mn шуу (bone (human)) · de Radius (line segment) · vi bán kính (line segment) · sh poluprečnik (length of this line segment) · hu sugár (line segment) · ko 반경 (line segment) · my အချင်းဝက် (line segment) · cmn 橈骨 /桡骨 (bone (human)) · ja 橈骨 (bone (human)) · sv radie (length of this line segment) · tr yarıçap (line segment) · vi xương quay (bone (human)) · sh poluprečnik (line segment) · eo radiuso (bone (human)) · ar نِصْف قُطْر (line segment) · ang hresel (bone (human)) · fi värttinäluu (bone (human)) · cy gwäell y fraich (bone (human)) · cs vřetenní kost (bone (human)) · fa شعاع (line segment) · mr त्रिज्या (length of this line segment) · hi त्रिज्या (length of this line segment) · bg лъчева кост (bone (human)) · ar شُعَاع (line segment) · eu erradio (line segment) · ms jejari (length of this line segment) · mn радиус (line segment) · nb radius (length of this line segment) · pl promień (length of this line segment) · id radius (line segment) · fo radius (line segment) · ja 半径 (line segment) · cmn 半徑 /半径 (line segment) · ar كُعْبُرَة (bone (human)) · nn radius (length of this line segment) · pt raio (length of this line segment) · kk радиус (line segment) · sl polmer (length of this line segment) · es radio (line segment) · hi त्रिज्या (line segment) · fi säde (line segment) · eo radiuso (line segment) · es radio (length of this line segment) · vo radiut (bone (human)) · cs poloměr (line segment) · io radiuso (bone (human)) · xal шу (bone (human)) · hu orsócsont (bone (human)) · ceb tungatid (line segment) · cs poloměr (length of this line segment) · uk ра́діус (length of this line segment) · tl lihit (line segment) · nl radius (bone (human)) · hy շառավիղ (length of this line segment) · ko 요골 (bone (human)) · mi pūtoro (line segment) · ga ga (line segment) · nb radius (line segment) · vo raid (length of this line segment) · gu ત્રિજ્યા (line segment) · ur نصف قطر (line segment) · arz كعبرة (bone (human)) · mk полупре́чник (length of this line segment) · da radius (line segment) · ro radius (bone (human)) · fr rayon (line segment) · th รัศมี (line segment) · fr radius (bone (human)) · sh palčana kost (bone (human)) · mn шуу яс (bone (human)) · sv radie (line segment) · ru лучева́я кость (bone (human)) · te వ్యాసార్థము (line segment) · et raadius (line segment) · id jari-jari (line segment) · uk ра́діус (line segment) · yi ראַדיוס (line segment)

wikidata: Q173817

radius en · VERB

Pronunciation

• /ˈɹeɪ.di.əs/
• (US) audio
• rā'-dē-əs

Etymology

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

Meanings

1. (transitive) To give a rounded edge to.
   • A comfortable grip is ensured by smoothing the surface of the handle and radiusing the edge. 2014, Anil Mital, Anoop Desai, Anand Subramanian, Product Development, page 358:

Forms

Relateds

semidiameter · ulna