n :  any of several oil and water emulsions that contain antigens and are used to stimulate antibody production in experimental animals
 
Freund, Jules Thomas (1890-1960), American immunologist. Freund was a pioneer in immunological research who developed basic laboratory methods that are now standard. He is known above all for his work on adjuvants that enhance the effectiveness of vaccines. In a 1944 article he discussed such adjuvants as paraffin oil, lanolin-like substances, and killed tubercle bacilli. Other areas of his research were the mechanisms of allergy, antibody formation, toxin-antitoxin reaction, tuberculosis, poliomyelitis, and malaria.
 
   
 
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