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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A highly contagious form of human influenza caused by a filterable virus identical or related to a virus formerly isolated from infected swine.

Wiktionary

  1. n. Influenza caused by orthomyxoviruses, which pass from pigs to humans.

WordNet 3.0

  1. n. an acute and highly contagious respiratory disease of swine caused by the orthomyxovirus thought to be the same virus that caused the 1918 influenza pandemic

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‘swine flu’ has been looked up 541 times, added to 9 lists, commented on 6 times, and is not a valid Scrabble word.