radius meaning, radius definition | English Cobuild dictionary

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radius

  
  ( radii    plural  )
1       n-sing   The radius around a particular point is the distance from it in any direction.  
with supp  
Nigel has searched for work in a ten-mile radius around his home.     
2       n-count   The radius of a circle is the distance from its centre to its outside edge.  
He indicated a semicircle with a radius of about thirty miles.     
Translation English Cobuild Collins Dictionary  
See also:

radish, radium, radio, radii

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