1. An antibody that occurs only in some individuals of a species and reacts specifically with a particular foreign isoantigen. For specific isoantibodies of blood group s, see the Blood Groups appendix. 2. Sometimes used as a synonym of alloantibody. [G. isos, equal]
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n.
an antibody that occurs only in some individuals of a species against the components of foreign tissues from an individual of the same species.
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iso·an·ti·body (i-so-anґtĭ-bod″e) an antibody produced by one individual that reacts with antigens (isoantigens) of another individual of the same species; called also alloantibody.Medical dictionary. 2011.