/ Dictionary / Index R ribonuclease: Meaning and Definition of Find definitions for: ri•bo•nu•cle•ase Pronunciation: (rī"bō-n'klē-ās", -āz", -ny'-), [key] — n. Biochem. any of the class of enzymes that catalyze the hydrolysis of RNA. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ribonuclease (Thesaurus) riboflavin ribonucleic acid 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