Par′rott-gun.
(Ordnance.) A kind of rifled cannon invented by Captain R. G. Parrott of the Cold Spring Foundry, West Point, N. Y., and much employed in the United States service during the late civil war. The body of the gun is of cast-iron, and is reinforced at the breech by shrinking on a ring of wrought-iron. The calibers are, 10-pounder, 2.9 inches bore; 20-pounder, 3.67 inches bore; 30-pounder, 4.2 inches bore; 100-pounder, 6.4 inches bore; 200-pounder, 8 inches bore: corresponding respectively to 3, 6, 9, 32, and 64 pounder smooth bores. The number of grooves increased with the caliber of the gun, the 10-pounder having three.