cannonn.[F. cannon, fr. L. canna reed, pipe, tube. See Cane.]1. A great gun; a piece of ordnance or artillery; a firearm for discharging heavy shot with great force.()()2. (Mech.) A hollow cylindrical piece carried by a revolving shaft, on which it may, however, revolve independently.()3. (Printing.) A kind of type. See Canon.()Cannon ball, strictly, a round solid missile of stone or iron made to be fired from a cannon, but now often applied to a missile of any shape, whether solid or hollow, made for cannon. Elongated and cylindrical missiles are sometimes called bolts; hollow ones charged with explosives are properly called shells. -- Cannon bullet, a cannon ball. [Obs.] -- Cannon cracker, a fire cracker of large size. -- Cannon lock, a device for firing a cannon by a percussion primer. -- Cannon metal. See Gun Metal. -- Cannon pinion, the pinion on the minute hand arbor of a watch or clock, which drives the hand but permits it to be moved in setting. -- Cannon proof, impenetrable by cannon balls. -- Cannon shot. (a) A cannon ball. (b) The range of a cannon.()v. i.1. To discharge cannon.()2. To collide or strike violently, esp. so as to glance off or rebound; to strike and rebound.()He heard the right-hand goal post crack as a pony cannoned into it -- crack, splinter, and fall like a mast. (Kipling.)n. & v. (Billiards) See Carom.()