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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Wi·dal's test, or  Wi·dal test or  Wi·dal reaction   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.
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From: WordNet (r) 2.0

 Widal's test
      n : a test for detecting typhoid fever and other salmonella
          infections [syn: Widal test]