nonself

[non-self] /nɒnˈsɛlf/

noun, Immunology

any antigen-bearing foreign material that enters the body and normally stimulates an attack by the body's immune system (distinguished from self).

Origin

1870-75; non- + self

nonself in Medicine

nonself non·self (nŏn-sělf')
n.
That which the immune system identifies as foreign to the body.