iceberg

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.

Related terms:

• Glacial Drift
• unconformity iceberg
• ice-island iceberg
• tabular iceberg
• fast ice
• ice foot
• tilted iceberg
• table iceberg
• pyramidal iceberg
• blocky iceberg