/ Dictionary / Index R ribose: Meaning and Definition of Find definitions for: ri•bose Pronunciation: (rī'bōs), [key] — n. Biochem. a white, crystalline, water-soluble, slightly sweet solid, CHO, a pentose sugar obtained by the hydrolysis of RNA. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ribose (Thesaurus) ribonucleotide riboso Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language