Breadcrumb Home > Dictionary > Index S severe combined immune deficiency: Meaning and Definition of Find definitions for: severe' combined' immune' defi"ciency Pronunciation: [key] — Pathol. Pathol. 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. severe Severinus TrendingHere are the facts and trivia that people are buzzing about. Did Birds Evolve from Dinosaurs? The Twelve Dancing Princesses Current Events This Week: January 2023 African Americans by the Numbers Andersen's Fairy Tales: Contents The Celtic Twilight: A Teller of Tales ✖ Related Content Daily Word Quiz: limpid Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language