Main Entry: gamma globulin

Function: noun

1 a : a protein fraction of blood rich in antibodies b : 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