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asteroid

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noun
  • any of many small planets revolving round the sun, esp between the orbits of Mars and Jupiter [Barron]
  • small planet [Nandigam]

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Wiktionary:
asteroid @ wiktionary
WordNet:
asteroid @ wordnet.princeton.edu
Merriam-Webster Online:
asteroid @ M-W.com
MSN Encarta:
asteroid @ Encarta
American Heritage Dictionary of the English Language:
asteroid @ AHD provided by Yahoo! Education
Answers.com:
asteroid @ Answers.com
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