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Meaning of RADIUS

Pronunciation:  'reydeeus

WordNet Dictionary
  1. [n]  support consisting of a radial member of a wheel joining the hub to the rim
  2. [n]  the length of a line segment between the center and circumference of a circle or sphere
  3. [n]  the outer and slightly shorter of the two bones of the human forearm
  4. [n]  a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles"
  5. [n]  a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

RADIUS is a 6 letter word that starts with R.


 Synonyms: r, spoke
 See Also: arm bone, bicycle wheel, cartwheel, diam, diameter, forearm, length, part, radius of curvature, region, semidiameter, straight line, support, wagon wheel



Webster's 1913 Dictionary
\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

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

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["o]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.

{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}.

Computing Dictionary

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Medical Dictionary
 Definition: Smaller of the two bones in lower arm.
Biology Dictionary
 Definition: The radius is one of the two bones (radius and ulna) in the forearm. It is shorter than ulna. But of the two, only radius articulates with the carpal bones of the wrist.