alloantigen

al·lo·an·ti·gen

noun \ˌal-ō-ˈant-ə-jən\

Definition of ALLOANTIGEN

: a genetically determined antigen present in some but not all individuals of a species (as those of a particular blood group) and capable of inducing the production of an alloantibody by individuals which lack it—called also isoantigen

—al·lo·an·ti·gen·ic \-ˌant-ə-ˈjen-ik\ adjective