COLUM′BIAD. A heavy gun invented by Colonel Bomford and combining some of the features of the gun, howitzer, and mortar, answering in this respect to the modern breach-loading rifled mortar or howitzer. It appeared early in the nineteenth century and was in use until after the War of the Rebellion. See Artillery; also Balllstics; Guns, Naval; and Ordnance.

COLUMBIAD.