swine flu

noun Pathology.
a highly contagious form of influenza caused by infection with a filterable virus first isolated from swine.

Origin:
1920–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
swine flu   (swīn)  Pronunciation Key 
A highly contagious form of influenza seen in swine, caused by a virus of the family Orthomyxoviridae. The infection is communicable to humans and caused a worldwide epidemic in 1918.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Swine flu is a respiratory infection caused by influenza viruses that regularly
  cause outbreaks in pigs.
Vaccines being made to protect people from swine flu may not be so healthy for
  threatened species of sharks.
Last summer everyone was in a panic about swine flu.
The swine flu pandemic highlights a decades-old problem: industrial animal
  farming poses serious public health risks.
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