/ Dictionary / Index R ribonucleoprotein: Meaning and Definition of Find definitions for: ri•bo•nu•cle•o•pro•tein Pronunciation: (rī"bō-n"klē-ō-prō'tēn, -tē-in, -ny"-), [key] — n. Biochem. a substance composed of RNA in close association with protein; a nucleoprotein containing RNA. Abbr.: RNP Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ribonucleic acid ribonucleoside Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language