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aurora

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noun
  • an atmospheric phenomenon consisting of bands, curtains, or streamers of light, usually green, red, or yellow, that move across the sky in polar regions [Barron]

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WordNet:
aurora @ wordnet.princeton.edu
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aurora @ M-W.com
MSN Encarta:
aurora @ Encarta
American Heritage Dictionary of the English Language:
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Answers.com:
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