Meaning of severe combined immune deficiency

severe' combined' immune' defi"ciency

Pronunciation: [key]
— Pathol. Pathol.
  1. a group of rare congenital disorders in which both cell-mediated and humoral immunity are lacking, causing susceptibility to a wide variety of illnesses and an inability to live in a normal environment.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.