iceberg

iceberg

a large mass of ice floating in the sea, esp a mass that has broken off a polar glacier

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

iceberg

[′īs‚bərg]

(oceanography)

A large mass of glacial ice broken off and drifted from parent glaciers or ice shelves along polar seas; it is distinguished from polar pack ice, which is sea ice, and from frozen seawater, whose rafted or hummocked fragments may resemble small icebergs.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.