Columbiad
Pronunciation : Co*lum"bi*ad
Part of Speech : n.
Etymology : [From Columbia the United States.] (Mil.)
Definition : Defn: 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