immunodeficiency /ˌimjʊnəʊdɪˈfɪʃənsɪ/

• 1. 

  N-UNCOUNT Immunodeficiency is a weakness in a person's immune system or the failure of a person's immune system. 免疫缺陷 [医学] [usu N n]

  例：

  ...a type of immunodeficiency disease totally unrelated to AIDS.

  ...与艾滋病完全没有关联的一类免疫缺陷疾病。