Main Entry: Was·ser·mann Pronunciation: 'wäs-&r-m&n, 'väs- Function: noun :WASSERMANN TEST Wasáserámann/'väs-&r-"män,/August Paul von(1866–1925), German bacteriologist. Wassermann is famous for discovering a universal blood-serum test for syphilis that helped to extend the basic tenets of immunology to diagnosis. Hisearly research dealt with cholera immunity and diphtheria antitoxin. He established a relationship between the presence of diphtheria in an individual's serum and an ability to resist diphtheriainfection. In 1906 he and the German dermatologist Albert Neisser developed a test for the antibody produced by persons infected with the causative agent of syphilis. The Wassermann reaction, incombination with other diagnostic procedures, is still used to test for the disease.