Source : Webster's Revised Unabridged Dictionary (1913)

Bullet \Bul"let\, n. [F. boulet, dim. of boule ball. See {Bull}
   an edict, and cf. {Boulet}.]
   1. A small ball.

   2. A missile, usually of lead, and round or elongated in
      form, to be discharged from a rifle, musket, pistol, or
      other small firearm.

   3. A cannon ball. [Obs.]

            A ship before Greenwich . . . shot off her ordnance,
            one piece being charged with a bullet of stone.
                                                  --Stow.

   4. The fetlock of a horse.

   Note: [See Illust. under {Horse}.]

Source : WordNet®

bullet
     n 1: a projectile that is fired from a gun [syn: {slug}]
     2: a high-speed passenger train [syn: {bullet train}]
     3: (baseball) a pitch thrown with maximum velocity; "he swung
        late on the fastball"; "he showed batters nothing but
        smoke" [syn: {fastball}, {heater}, {smoke}, {hummer}]