idioisoagglutinin

An idioagglutinin occurring in the blood of an animal of a certain species, capable of agglutinating the cells from animals of the same species. [idio- + G. isos, equal, + agglutinin]

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id·io·iso·ag·glu·ti·nin (id″e-o-i″so-ə-glooґtĭ-nin) an isoagglutinin normally present in the blood, and not produced by artificial means.