A substance (antigen) capable of rendering an individual susceptible to anaphylaxis; a substance (antigen) that will cause an anaphylactic reaction in such a sensitized individual.
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ana·phy·lac·to·gen -tə-jən n any substance capable of producing a condition of anaphylaxis
an·a·phy·lac·to·gen·ic -.lak-tə-'jen-ik adj
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ana·phy·lac·to·gen (an″ə-fə-lakґto-jen) an antigen capable of inducing anaphylaxis.Medical dictionary. 2011.