/ Dictionary / Index U uridine: Meaning and Definition of Find definitions for: u•ri•dine Pronunciation: (yoor'i-dēn", -din), [key] — n. Biochem. a ribonucleoside composed of ribose and uracil. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. uricolysis Uriel Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language