Word Study
widal reaction
CIDE DICTIONARY
widal reaction, [After Fernand Widal (b. 1862), French physician.].
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 1913 Suppl.]
For further exploring for "widal reaction" in Webster Dictionary Online