agammaglobulinaemiaPronunciation: /eɪˌgaməˌglɒbjʊlɪˈniːmɪə/ (also agammaglobulinemia)Definition of agammaglobulinaemia noun [mass noun] Medicine lack of gamma globulin in the blood plasma, causing immune deficiency. agammaglobulinaemia in other Oxford dictionaries Definition of agammaglobulinaemia in the US English dictionary