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radius Definition

ra·dius (rā′dē əs)

noun pl. -·dii′-ī′ or -·uses

  1. a raylike or radial part, as a spoke of a wheel
    1. any straight line extending from the center to the periphery of a circle or sphere
    2. the length of such a line
    1. the circular area or distance limited by the sweep of such a line no house within a radius of five miles
    2. the distance a ship or airplane can travel and still return to its point of origin without refueling
  4. an extent, scope, range, etc. of a limited or specified kind within the radius of one's experience
    1. the shorter and thicker of the two bones of the forearm on the same side as the thumb
    2. a corresponding bone of the forelimb of a four-legged animal
  6. Zool.
    1. any of the planes of division of the body of a radially symmetrical animal
    2. any of various longitudinal veins in the wing of an insect

Etymology: L, rod, spoke (of a wheel), hence radius, ray (of light), ? akin to radix, root

radius Synonyms

radius

n.

space, sweep, range, semidiameter, spoke, compass, reach, span, interval, limit, scope, extent; see also boundary, expanse.

radius Telecom Definition
A straight line extending from the center of a circle to its edge, or from the center of a sphere to its surface. See also bend radius and radian.
RADIUS (Remote Authentication Dial-In User Service) Telecom Definition
An Internet protocol used for authentication, authorization, and accounting of end users seeking to gain access to internal computer resources, generally through a network access server (NAS) or, for remote users, by dialing into a remote access server (RAS). Originally developed by Livingston Enterprises, RADIUS was later described by the IETF in RFCs 2058 and 2059 and is currently described in RFCs 2865 and 2866. See also authentication, authorization, IETF, NAS, RAS, and RFC.
radius Usage Examples

Preposition: of

  • gyration: The automatic choice of the cut-off radius for RF is twice the radius of gyration.
  • curvature: A shaving or make-up mirror of this type has a radius of curvature of 30 cm.
  • convergence: Post refinement gives very accurate cell parameters but has a relatively small radius of convergence.
  • sphere: Here b is the radius of a three sphere of constant distance, sigma, from the north pole of the instanton.

Converse of object

  • bend: The bend radius is set at 24 turns for the cylindrical mirror.

Adjective modifier

  • 20-mile: The project must be within a 20-mile radius of a B&Q store.
  • 10-mile: Dr. Chris Busby, EU child health expert, explained: ' Small particles will move within a 10-mile radius.
  • covalent: The type of atomic radius being measured here is called the metallic radius or the covalent radius depending on the bonding.
  • 50-mile: There are around 10 licensed companies within a 50-mile radius of Cleveland.
  • ionic: Atomic and ionic radius increase down both groups as can be predicted from the increasing number of shells.
  • 30-mile: In 2003, Waitrose launched a " locally produced " range where the food sold in a store is farmed within a 30-mile radius.

Modifies a noun

  • r: Schwarzschild radius The radius r of the event horizon for a Schwarzschild black hole.
  • R: Example 9.9 Find the area of a circle of radius R.
  • topology: Radius Topology works seamlessly with MapInfo products in an Oracle environment.

Noun used with modifier

  • five-mile: Remember 80,000 of those people live within a five-mile radius of the hospital.
  • mile: The project area extends to a four mile radius from the center of Norwich to the fringe.
  • one-mile: A compromise was reached whereby only cases discovered within a one-mile radius of the hospital would be admitted.
  • two-mile: Nearby Attractions Two great Lakeland pubs lie within a two-mile radius of the site providing excellent pub food.
  • ten-mile: Its aim is to provide a friendly service for the town, and people living within a ten-mile radius.
  • three-mile: A variety of dining options are within a three-mile radius of the hotel.

Browse dictionary entries near radius

  1. ‹ radium therapy
  2. ‹ radium
  3. ‹ radish
  4. ‹ radiotracer
  5. ‹ radiothorium
  6. ‹ radiothermy
  7. ‹ radiotherapy
  8. ‹ radiotelephone
  9. ‹ radiotelegraph
  10. ‹ radiostrontium
  1. radius vector ›
  2. radix ›
  3. RAdm ›
  4. Radnorshire ›
  5. Radom ›
  6. radome ›
  7. radon ›
  8. radula ›
  9. radwaste ›
  10. Rae ›