/ Dictionary / Index R ribonucleotide: Meaning and Definition of Find definitions for: ri•bo•nu•cle•o•tide Pronunciation: (rī"bō-n'klē-u-tīd", -ny'-), [key] — n. Biochem. an ester, composed of a ribonucleoside and phosphoric acid, that is a constituent of ribonucleic acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ribonucleoside ribose Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language