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From: Webster's Revised Unabridged Dictionary (1913)

 Co·lum·bi·ad n.  Mil. A form of seacoast cannon; a long, chambered gun designed for throwing shot or shells with heavy charges of powder, at high angles of elevation.
 Note:Since the War of 1812 the Columbiad has been much modified, especially by General Rodman, and the improved form now used in seacoast defense is often called the Rodman gun.