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
: 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
Subgroup of the globulins. In humans and many other mammals, most antibodies are in the gamma globulin fraction of blood. A human gamma globulin preparation may be administered (by injection) to persons lacking immunity, either generally or to a particular disease, after exposure or before expected exposure.