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swine flu vs. flu

[ swahyn-floo ]
noun
  1. a form of influenza that afflicts pigs.
  2. a form of influenza that afflicts humans by infection with a virus once thought to be very similar to the influenza virus found in North American pigs.
[ floo ]
noun
  1. influenza.
  2. a specific variety of influenza, usually named for its point of dissemination or its animal vector: Hong Kong flu; swine flu.