(n) immunological disorder in which some part of the body's immune system is inadequate and resistance to infectious diseases is reduced, Ant. immunocompetence
(n) a congenital disease affecting T cells that can result from a mutation in any one of several different genes; children with it are susceptible to infectious disease; if untreated it is lethal within the first year or two of life, Syn. severe combined immunodeficiency disease, SCID