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Terminology

The term gun may refer to any sort of projectile weapon from large cannons to small firearms including those that are usually hand-held (handgun). The word gun is also commonly used to describe objects which, while they are not themselves weapons, produce an effect or possess a form which is in some way evocative of a handgun or long gun.

The use of the term "cannon" is interchangeable with "gun" as words borrowed from the French language during the early 15th century, from Old French canon, itself a borrowing from the Italian cannone, a "large tube" augmentative of Latin canna "reed or cane".[17] Recent scholarship indicates that the term "gun" may have its origins in the Norse woman's name "Gunnildr" (or "Gunnild", possibly Queen Gunhild of Wenden, wife of King Sweyn Forkbeard[citation needed]), which was often shortened to "Gunna".[18] The earliest recorded use of the term "gonne" was in a Latin document circa 1339. Other names for guns during this era were "schioppi" (Italian translation-"thunderers"), and "donrebusse" (Dutch translation-"thunder gun") which was incorporated into the English language as "blunderbuss".[18] Artillerymen were often referred to as "gonners" and "artillers" Early guns and the men who used them were often associated with the devil and the gunner's craft was considered a black art, a point reinforced by the smell of sulfur on battlefields created from the firing of guns along with the muzzle blast and accompanying flash.[20]

The word cannon is retained in some cases for the actual gun tube but not the weapon system. The title gunner is applied to the member of the team charged with operating, aiming, and firing a gun.

Autocannons are automatic guns designed primarily to fire shells and are mounted on a vehicle or other mount. Machine guns are similar, but usually designed to fire simple projectiles. In some calibers and some usages, these two definitions overlap.

In contemporary military and naval parlance the term gun has a very specific meaning and refers solely to any large-calibre, direct-fire, high-velocity, flat-trajectory artillery piece employing an explosive-filled hollowed metal shell or solid bolt as its primary projectile.[citation needed] This later usage contrasts with large-calibre, high-angle, low-velocity, indirect-fire weapons such as howitzers, mortars, and grenade launchers which invariantly employ explosive-filled shells. In other military use, the term "gun" refers primarily to direct fire weapons that capitalize on their muzzle velocity for penetration or range. In modern parlance, these weapons are breech-loaded and built primarily for long range fire with a low or almost flat ballistic arc. A variation is the howitzer or gun-howitzer designed to offer the ability to fire both low or high-angle ballistic arcs. In this use, example guns include naval guns. A less strict application of the word is to identify one artillery weapon system or non-machine gun projectile armament on aircraft.

A related military use of the word is in describing gun-type fission weapon. In this instance, the "gun" is part of a nuclear weapon and contains an explosively propelled sub-critical slug of fissile material within a barrel to be fired into a second sub-critical mass in order to initiate the fission reaction. Potentially confused with this usage are small nuclear devices capable of being fired by artillery or recoilless rifle.

In civilian use, the captive bolt pistol is used in agriculture to humanely stun farm animals for slaughter.[21]

Shotguns are normally civilian weapons used primarily for hunting. These weapons are typically smooth bored and fire a shell containing small lead or steel balls. Variations use rifled barrels or fire other projectiles including solid lead slugs, a Taser XREP projectile capable of stunning a target, or other payloads. In military versions, these weapons are often used to burst door hinges or locks in addition to antipersonnel uses.