Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A test of blood serum that uses an agglutination reaction to diagnose typhoid fever.
 
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun   The 
agglutination test fortyphoid fever . 
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a test for detecting typhoid fever and other salmonella infections
 
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Fernand   Widal,  (1862–1929), French physician.]
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Examples
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