GUN, noun An instrument consisting of a barrel or tube of iron or other metal fixed in a stock, from which balls, shot or other deadly weapons are discharged by the explosion of gunpowder. The larger species of guns are called cannon; and the smaller species are called muskets, carbines, fowling pieces, etc. But one species of fire-arms, the pistol, is never called a gun
GUN, verb intransitive To shoot.
GUN'-BARREL, noun The barrel or tube of a gun