Firearm (noun)

A weapon that discharges a missile at high velocity, especially a handgun, rifle, or machine gun.

Origin:

Early 16th century: from fire + arm.

Examples:

1. The use of firearms is strictly regulated in this country.
2. The criminal was found to be in possession of a firearm.
3. He was trained in the use of firearms.
4. Firearms were used by both sides in the war.
5. The store specializes in the sale of firearms and ammunition.