noun
Etymology: International Scientific Vocabulary gamma (II) + globulin
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, rubella, infectious hepatitis, or poliomyelitis
2. : any of numerous globulins of plasma or serum that have less electrophoretic mobility at alkaline pH than serum albumins, alpha globulins, or beta globulins and that include most antibodies