Iceberg \Ice"berg`\, n. [Prob. of Scand. origin; cf. Dan. iisbierg, Sw. isberg, properly, a mountain of ice. See Ice, and Berg.]

A large mass of ice, generally floating in the ocean.

Note: Icebergs are large detached portions of glaciers, which in cold regions often project into the sea.

Source: Webster's Revised Unabridged Dictionary (1913)