acquired immune deficiency syndrome acquired immune deficiency syndrome /əˈkwaɪrd ɪˈmjuːn dɪˈfɪʃənsi ˈsɪndroʊm/

noun

1. A serious (often fatal) disease of the immune system transmitted through blood products especially by sexual contact or contaminated needles  ( acquired immune deficiency syndrome , AIDS )
   a serious (often fatal) disease of the immune system transmitted through blood products especially by sexual contact or contaminated needles