Radii

4 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Radii \Ra"di*i\ (r[=a]"d[i^]*[imac]), n.,
     pl. of {Radius}.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:



  Radius \Ra"di*us\ (r[=a]"d[i^]*[u^]s), n.; pl. L. {Radii}
     (r[=a]"d[i^]*[imac]); E. {Radiuses}
     (r[=a]"d[i^]*[u^]s*[e^]z). [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.
        [1913 Webster]
  
     2. (Anat.) The preaxial bone of the forearm, or brachium,
        corresponding to the tibia of the hind limb. See Illust.
        of {Artiodactyla}.
        [1913 Webster]
  
     Note: The radius is on the same side of the limb as the
           thumb, or pollex, and in man it is so articulated that
           its lower end is capable of partial rotation about the
           ulna.
           [1913 Webster]
  
     3. (Bot.) A ray, or outer floret, of the capitulum of such
        plants as the sunflower and the daisy. See {Ray}, 2.
        [1913 Webster]
  
     4. pl. (Zool.)
        (a) The barbs of a perfect feather.
        (b) Radiating organs, or color-markings, of the radiates.
            [1913 Webster]
  
     5. The movable limb of a sextant or other angular instrument.
        --Knight.
        [1913 Webster]
  
     {Radius bar} (Mach.), 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}.
        [1913 Webster]

From WordNet (r) 2.0 [wn]:

  radius
       n 1: the length of a line segment between the center and
            circumference of a circle or sphere [syn: {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 [syn: {spoke}]
       [also: {radii} (pl)]

From WordNet (r) 2.0 [wn]:

  radii
       See {radius}