Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

Widal reaction

noun Wi·dal reaction

Medical Definition of Widal reaction

  1. :  a specific reaction consisting in agglutination of typhoid bacilli or other salmonellas when mixed with serum from a patient having typhoid fever or other salmonella infection and constituting a test for the disease



Biographical Note for widal reaction

Wi·dal \vē-däl\ Georges–Fernand–Isidore (1862–1929), French physician and bacteriologist. Widal held a professorship of pathology and internal medicine at the University of Paris. In 1896 he developed the Widal reaction, a procedure for diagnosing typhoid fever based on the fact that antibodies in the blood of an infected individual cause the bacteria to bind together into clumps. In 1906 he recognized that the retention of sodium chloride was a feature found in cases of nephritis and cardiac edema, and he recommended salt deprivation as part of the treatment for both diseases.

Variants of widal reaction

also Wi·dal's reaction \vē-ˈdäl(z)-\play

Seen and Heard

What made you want to look up Widal reaction? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 6, 2016

an official order, decree, or edict

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

spindrift pince-nez duvet kittly-benders
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ