radius
Language: English
Part of speech: noun
Pronunciation: enpr: rā'-dē-əs
ipa: /ˈɹeɪ.di.əs/
rhymes: -eɪdiəs
Forms: form: radii
form: radiuses
Etymology: Borrowed from Latin radius (“ray”). Doublet of ray.
Senses: examples: text: It is also obvious, and proved by experiment, that the rotatory motions observed in the hand proceed from the rotatory motions of the radius.
ref: 1808, John Barclay, The Muscular Motions of the Human Body, →OCLC, page 396:
topics: anatomy
medicine
sciences
glosses: The long bone in the forearm, on the side of the thumb.
topics: biology
natural-sciences
zoology
glosses: The lighter bone (or fused portion of bone) in the forelimb of an animal.
topics: biology
entomology
natural-sciences
glosses: 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.
examples: text: Fatima claims to have visited all the bars within a five-mile radius of her Manhattan apartment.
text: 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.
ref: 1994, Viacheslav V. Nikulin, Igor R. Shafarevich, translated by Miles Reid, Geometries and Groups, Springer, page 194:
text: 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.
ref: 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:
topics: geometry
mathematics
sciences
glosses: A line segment between any point of a circle or sphere and its center.
examples: text: 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 ...
ref: 1998, Dieter Schuocker, Handbook of the Eurolaser Academy, Springer Science & Business Media, →ISBN, page 51:
topics: geometry
mathematics
sciences
glosses: The length of this line segment.
examples: text: […] 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; […]
ref: 1674, Robert Hooke, Animadversions on the Firſt Part of the Machina Coelestis of the […] Aſtronomer Johannes Hevelius […] , page 43:
glosses: 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.
topics: graph-theory
mathematics
sciences
glosses: The minimum eccentricity of any vertex, for a given graph.
Synonyms: sense: vein of insect wing
word: R
Derived terms: atomic radius
Bohr radius
circumradius
covalent radius
Debye radius
Earth radius
equiradiate
exradius
gyradius
gyroradius
hydraulic radius
hyperradius
inradius
interradius
ionic radius
metallic radius
potato radius
radian
radion
radius arm
radius bar
radius of action
radius of convergence
radius of curvature
radius of gyration
radius rod
radius vector
Roche radius
Schwarzschild radius
sight radius
triradius
van der Waals radius
Related terms: radial
radiad
radiate
radiation