/ Dictionary / Index R Rx: Meaning and Definition of Find definitions for: Rx Pronunciation: [key] prescription. (in prescriptions) take. tens of rupees. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Rwy. -ry Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language