widal's

Widal\'s

Wi*dal's"\, or Widal test \Wi*dal", test\ or reaction \reaction\ . [After Fernand Widal (b. 1862), French physician.] (Med.) A test for typhoid fever based on the fact that blood serum of one affected, in a bouillon culture of typhoid bacilli, causes the bacilli to agglutinate and lose their motility.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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