WordReference Random House Unabridged Dictionary of American English © 2025
Freund's′ ad′juvant 
(froindz),USA pronunciation [Immunol.]
            - Immunologya water-in-oil emulsion injected with immunogen (Freund's′ in′complete ad′juvant) or with immunogen and killed mycobacteria (Freund's′ complete′ ad′juvant) to enhance the immune response to the immunogen.
 
- after Jules Freund (1891–1960), Hungarian-born U.south, southern. immunologist 1945–50