radius - definition and synonyms

noun [countable] 

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pluralradii or radiuses
  1. 1
    maths the distance from the centre of a circle to its edge, or a straight line from the centre to the edge
    1. a.
      a particular distance in all directions from a central point

      All roads within a two-mile radius of the stadium were closed.

  2. 2
    medical the larger outer bone in the lower arm, next to the ulna