agammaglobulinemia Syllabification: (a·gam·ma·glob·u·li·ne·mi·a)Pronunciation: /ˌāgaməˌgläbyələˈnēmēə/Definition of agammaglobulinemia noun Medicine lack of gamma globulin in the blood plasma, causing immune deficiency. agammaglobulinemia in other Oxford dictionaries Definition of agammaglobulinemia in the British & World English dictionary