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. 2013.
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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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00:10
Swine flu is always a great word to know.
So is doohickey. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
Example sentences
Any virus that can jump the barrier, such as the one that causes swine flu,
  probably already has.
Vaccines being made to protect people from swine flu may not be so healthy for
  threatened species of sharks.
It is important to know if swine flu viruses are spreading among people so that
  cases in other people can be prevented.
Viral diseases such as swine flu have spread quickly around the world by air.
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