radius — English Dictionary

radius
Pronunciations (2)
  • /ˈɹeɪ.di.əs/
  • ˈɹeɪ.di.əs

Noun

  1. The long bone in the forearm, on the side of the thumb.

    Examples

    It is also obvious, and proved by experiment, that the rotatory motions observed in the hand proceed from the rotatory motions of the radius.

  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.

    Examples

    Fatima claims to have visited all the bars within a five-mile radius of her Manhattan apartment.

    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.

    More examples (1)

    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.

  5. The length of this line segment.

    Examples
    More examples (1)

    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 ...

  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.

    Examples
    More examples (1)

    […] 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; […]

  7. The minimum eccentricity of any vertex, for a given graph.

Verb

  1. To give a rounded edge to.

    Usage
    • Transitive
    Related words
    Examples

    A comfortable grip is ensured by smoothing the surface of the handle and radiusing the edge.

Noun

  1. the length of a line segment between the center and circumference of a circle or sphere

    Synonyms
    Broader terms
  2. a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

    Broader terms
  3. a circular region whose area is indicated by the length of its radius

    Broader terms
    Examples

    they located it within a radius of 2 miles

  4. the outer and slightly shorter of the two bones of the human forearm

    Broader terms
  5. support consisting of a radial member of a wheel joining the hub to the rim

    Broader terms
Word forms
radiiradiusesradiusesradiusingradiusedradiused

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