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1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   ballistic missile \bal*lis"tic mis`sile\, n.
      A rocket-propelled missile of long range which is guided only
      during the powered portion of its flight, which usually takes
      only a small part of the total flight time; -- contrasted
      with guided missile.
      Note: Ballistic missiles are sometimes referred to by their
            range, such as an
      intercontinental ballistic missile (ICBM) or an
      intermediate range ballistic missile (IRBM).
         [PJC]