radius meaning, radius definition | English Cobuild dictionary

Collins

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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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"