from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The Arctic Circle.
- n. The Antarctic Circle.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of the two parallels of the Earth located at the latitude of 66° 33′ 44″ N and 66° 33′ 44″ S.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a line of latitude at the north or south poles
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