from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The seaward edge of an ice shelf, typically consisting of high cliffs of ice and presenting an impenetrable obstacle to ships.
  • noun A seasonally fluctuating accumulation of pack ice that presents an obstacle to shipping.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun a part of the Antarctic ice shelf that extends into the sea


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