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virus

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noun
  • simple organism, smaller than bacteria, and causing infectious disease [Barron]
  • disease communicator [Nandigam]

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