Medical Definition of gamma globulin
1a: a protein fraction of blood rich in antibodiesb: a sterile solution of gamma globulin from pooled human blood administered especially for passive immunity against measles, German measles, hepatitis A, or poliomyelitis
2: any of numerous globulins of blood plasma or serum that have less electrophoretic mobility at alkaline pH than serum albumins, alpha globulins, or beta globulins and that include most antibodies
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