[Fr. canon; from L. canna, reed, pipe, tube.] Apiece of ordnance or artillery. The large cannon now in use consists of a forged steel tube strengthened with massive steel rings shrunk upon it. Howitzers and mortars are sometimes called cannon. Cannon are distinguished by the weight of the ball, or the diameter of their bore. Some of the great rifled guns now in use can send a heavy ball a distance of 10 or 12 miles.