[Sửa]Any kind of weapon consisting of a metal tubeand often held in the hand with a grip at one end, from whichbullets or other missiles are propelled with great force, esp.by a contained explosion.
[Sửa]Any device imitative of this, e.g.a starting pistol.
[Sửa]A device for discharging insecticide,grease, electrons, etc., in the required direction (often incomb.: grease-gun).