Source : Webster's Revised Unabridged Dictionary (1913)

Projectile \Pro*ject"ile\, a. [Cf. F. projectile.]
   1. Projecting or impelling forward; as, a projectile force.

   2. Caused or imparted by impulse or projection; impelled
      forward; as, projectile motion. --Arbuthnot.

Projectile \Pro*ject"ile\, n. [Cf. F. projectile.]
   1. A body projected, or impelled forward, by force;
      especially, a missile adapted to be shot from a firearm.

   2. pl. (Mech.) A part of mechanics which treats of the
      motion, range, time of flight, etc., of bodies thrown or
      driven through the air by an impelling force.

Source : WordNet®

projectile
     adj : impelling or impelled forward; "a projectile force"; "a
           projectile missile"
     n : a weapon that is thrown or projected [syn: {missile}]