Bullet (noun)

1. A metal projectile that is shot from a gun.
2. A round missile for a firearm of any kind.
3. A small ball or projectile that is shot from a gun, sling, or other weapon.

Origin:

Middle english, from middle french, from boulle ball, bullet, from latin bulla bubble.

Examples:

1. He fired a bullet at the target.
2. The bullet went through the wall.
3. The soldier was hit by a bullet.
4. The rifle was designed to shoot a special type of bullet.
5. The bullet missed its target.