Etymology
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antigen (n.)

"substance that causes production of an antibody," 1908, from German Antigen, from French antigène (1899), from anti(body) (see antibody) + -gen.

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Definitions of antigen

antigen (n.)
any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies);
From wordnet.princeton.edu