/ Dictionary / Index R radiopharmaceutical: Meaning and Definition of Find definitions for: ra•di•o•phar•ma•ceu•ti•cal Pronunciation: (rā"dē-ō-fär"mu-s'ti-kul), [key] — n. Pharm. any of a number of radioactive drugs used diagnostically or therapeutically. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: radiopharmaceutical (Thesaurus) radiophare radiophone Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language