from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Either of the regions around the poles of the earth that are permanently covered with ice.
- n. A high-altitude icecap.
- n. Astronomy Either of the regions around the poles of Mars that are covered with frozen carbon dioxide and water.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A high-latitude region of a celestial body that is covered by ice.
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