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An isoantibody normally present in the serum of an individual that causes the agglutination of the red blood cells of another individual of the same species.
(Biology) an antibody that causes agglutination of red blood cells in animals of the same species from which it was derived
i•so•ag•glu•ti•nin(ˌaɪ soʊ əˈglut n ɪn)
an agglutinin that can effect isoagglutination.