Source : Webster's Revised Unabridged Dictionary (1913)

Ballistic \Bal*lis"tic\, a.
   1. Of or pertaining to the ballista, or to the art of hurling
      stones or missile weapons by means of an engine.

   2. Pertaining to projection, or to a projectile.

   {Ballistic pendulum}, an instrument consisting of a mass of
      wood or other material suspended as a pendulum, for
      measuring the force and velocity of projectiles by means
      of the arc through which their impact impels it.

Source : WordNet®

ballistic
     adj : relating to or characteristic of the motion of objects
           moving under their own momentum and the force of
           gravity; "ballistic missile"