Added 9 October 2026 immunodeficiency /ɪˌmjuːnəʊdɪˈfɪʃənsi/ noun Categories: Describing WordsUncommon Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about immunodeficiency at Wordnik → Where our words come from → A depletion in the body's natural immune system, or in some component of it. Related Words: immunizationvaccinationimmunisationimmunityimmunologyimmunologicalvirushivsyndromechildshortagelack Back to today's word