- immunoglobulin, Ig, immune serum globulin, immune gamma globulin, immune globulin - a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response
--1 is a kind of gamma globulin, human gamma globulin; antibody
--1 has particulars:immunoglobulin A, IgA; immunoglobulin D, IgD; immunoglobulin E, IgE; immunoglobulin G, IgG; immunoglobulin M, IgM; tetanus immunoglobulin, tetanus immune globulin