A weapon consisting essentially of a metal tube (massive enough to require to be mounted on a carriage or a fixed substructure) from which heavy…

A large machine or instrument used in warfare, as a battering ram, catapult, etc. (now historical). Also: †a smaller weapon, as a bow, sword, or…

A firearm or gun of such size that it needs to be mounted for firing; a piece of heavy ordnance. Now historical.

Artillery for discharging missiles. Usually in plural. A piece of ordnance for discharging missiles; a large gun. Obsolete.

A large, heavy piece of artillery formerly used in warfare, typically one requiring to be mounted for… In singular and plural.

A weapon; a firearm. A cannon or similar large-calibre gun; spec. the barrel of such a weapon.

A thing which emits or vomits fire; esp. a cannon.

A cannon; also a rifle or hand-gun. poetic.

slang. A pistol; occasionally a cannon.

The name by which cannon were known to some African peoples.

(chiefly in plural) (a) a piece of heavy artillery; cf. great gun, n. 1; (b) an important or powerful person; cf. great gun, n. 2.

Firearms. A centre-fire gun; (also) a centre-fire cartridge. Cf. rimfire, n.