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 shelfthat extends into the sea
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