Iceberg (?), 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.
[1913 Webster]

&hand_; Icebergs are large detached portions of glaciers, which in cold regions often project into the sea.
[1913 Webster]