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Radius
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English Dictionary: radius by the DICT Development Group
3 results for radius
From WordNet (r) 3.0 (2006) [wn]:
radius
n
  1. the length of a line segment between the center and circumference of a circle or sphere
    Synonym(s): radius, r
  2. a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
  3. a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles"
  4. the outer and slightly shorter of the two bones of the human forearm
  5. support consisting of a radial member of a wheel joining the hub to the rim
    Synonym(s): spoke, wheel spoke, radius
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Radius \Ra"di*us\, n.; pl. L. {Radii}; E. {Radiuses}. [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}.
  
      Note: The radius is on the same side of the limb as the
               thumb, or pollex, and in man it 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. (Zo[94]l.)
            (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} (Math.), 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}.

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   RADIUS
  
      {Remote Authentication Dial-In User Service}
  
  
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