/ Dictionary / Index R RNA synthetase: Meaning and Definition of Find definitions for: RNA synthetase Pronunciation: [key] — Biochem. Biochem. an enzyme that catalyzes the synthesis of RNA in cells infected with RNA viruses, allowing production of copies of the viral RNA. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. RNase RNA virus Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language