bayonet

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A blade adapted to fit the muzzle end of a rifle and used as a weapon in close combat.
2. v. To prod, stab, or kill with this weapon.

Century Dictionary and Cyclopedia

1. n. A short flat dagger.
2. n. A dagger or short stabbing instrument of steel for infantry soldiers, made to be attached to the muzzle of a gun. In its original form it has a sharp point and three edges, but other forms have been introduced. (See below.) It was at first inserted in the barrel of the gun, after the soldier had fired, by a wooden handle fitted to the bore; but it was afterward made with an iron socket and ring passing over the muzzle, and attached to the blade by a shoulder, so that the soldier might fire with his bayonet fixed.
3. n. In machinery, a pin which plays in and out of holes made to receive it, and which thus serves to connect and disconnect parts of the machinery. See bayonet-clutch.
4. To stab with a bayonet; compel or drive by the bayonet.

Wiktionary

1. n. Weapon A pointed instrument of the dagger kind fitted on the muzzle of a musket or rifle, so as to give the soldier increased means of offence and defence. Originally, the bayonet was made with a handle, which required to be fitted into the bore of the musket after the soldier had fired.
2. n. A pin which plays in and out of holes made to receive it, and which thus serves to engage or disengage parts of the machinery.
3. v. transitive To stab with a bayonet.
4. v. transitive To compel or drive by the bayonet.

GNU Webster's 1913

1. n. (Mil.) A pointed instrument of the dagger kind fitted on the muzzle of a musket or rifle, so as to give the soldier increased means of offense and defense.
2. n. (Mach.) A pin which plays in and out of holes made to receive it, and which thus serves to engage or disengage parts of the machinery.
3. v. To stab with a bayonet.
4. v. To compel or drive by the bayonet.

WordNet 3.0

1. n. a knife that can be fixed to the end of a rifle and used as a weapon
2. v. stab or kill someone with a bayonet