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The agglutination of the red blood cells of an individual by antibodies in the serum of another individual of the same species.
(Biology) the agglutination of red blood cells of an organism by the blood serum of another organism of the same species
i•so•ag•glu•ti•na•tion(ˌaɪ soʊ əˌglut nˈeɪ ʃən)
the clumping of the red blood cells by a transfusion of the blood or serum of a genetically different individual of the same species.