from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An innate, acquired, or induced inability to develop a normal immune response.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A depletion in the body's natural immune system, or in some component of it.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. immunological disorder in which some part of the body's immune system is inadequate and resistance to infectious diseases is reduced
immuno- + deficiency (Wiktionary)