/ Dictionary / Index R RNA polymerase: Meaning and Definition of Find definitions for: RNA polymerase Pronunciation: [key] — Biochem. Biochem. an enzyme that synthesizes the formation of RNA from a DNA template during transcription. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. RNA R.N.A.S. Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language