immunogen

noun
im·​mu·​no·​gen | \i-ˈmyü-nə-jən, -ˌjen\

Definition of immunogen 

: a substance that produces an immune response

First Known Use of immunogen

1959, in the meaning defined above

History and Etymology for immunogen

from Immunogen, a trademark

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The first known use of immunogen was in 1959

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immunogen

noun
im·​mu·​no·​gen | \i-ˈmyü-nə-jən, ˈim-yə-nə-, -ˌjen\

Medical Definition of immunogen 

: an antigen that provokes an immune response (as antibody production)

More from Merriam-Webster on immunogen

Britannica.com: Encyclopedia article about immunogen

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