that fraction of blood serum which contains most antibodies, used in the temporary prevention of several infectious diseases, as measles and hepatitis
See gamma globulin in American Heritage Dictionary 4
also gam·ma·glob·u·lin
noun
A protein fraction of blood serum containing many antibodies that protect against bacterial and viral infectious diseases.
A solution of gamma globulin prepared from human blood and administered for passive immunization against measles, German measles, hepatitis A, and other infections.