COLUMBIAD

Co*lum"bi*ad, n. Etym: [From Columbia the United States.] (Mil.)

Definition: 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 form now used in seacoast defense is often called the Rodman gun.

Source: Webster’s Unabridged Dictionary 1913 Edition