/ Dictionary / Index A adenosine deaminase deficiency: Meaning and Definition of Find definitions for: aden'osine deam'inase defi"ciency Pronunciation: [key] a severe immune system disorder caused by a genetic inability to produce adenosine deaminase. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. adenosine deaminase adenosine diphosphate Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language