ANTIGEN

[an.ti.gen] n [G, fr. F antigene, fr. anticorps antibody + -gene -gen] (1908): a usu. protein or carbohydrate substance (as a toxin or enzyme) capable of stimulating an immune response -- an.ti.gen.ic adj -- an.ti.gen.i.cal.ly adv -- an.ti.ge.nic.i.ty n