immunotoxin

noun
im·mu·no·tox·in | \ˈim-yə-nō-ˌtäk-sən, im-ˈyü-nō- \

Medical Definition of immunotoxin 

: a toxin that is linked to a monoclonal antibody and that is delivered to only those cells (as cancer cells) bearing the antigen targeted by the monoclonal antibody to which it is linked

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