/ Dictionary / Index R RNase: Meaning and Definition of Find definitions for: RNase Pronunciation: (är'en'ās, -āz), [key] — n. Biochem. ribonuclease. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rnase (Thesaurus) R.N.A.S. RNA synthetase Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language