Definition of swine influenza
: influenza A of swine that is caused by any of several subtypes (such as H1N1 or H3N2) of the causative orthomyxovirus and in which sporadic transmission to humans has occurred — compare swine flu
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Merriam-Webster unabridged
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Time Traveler for swine influenza
The first known use of swine influenza was in 1919
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