n.
A test of blood serum that uses an agglutination reaction to diagnose typhoid fever.
[After Fernand Widal (1862-1929), French physician.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
