/ Dictionary / Index A adenosine: Meaning and Definition of Find definitions for: a•den•o•sine Pronunciation: (u-den'u-sēn", -sin), [key] — n. a white, crystalline, water-soluble nucleoside, CHNO, of adenine and ribose. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: adenosine (Thesaurus) adenosarcoma adenosine arabinoside Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language