/ Dictionary / Index O oxymorphone: Meaning and Definition of Find definitions for: ox•y•mor•phone Pronunciation: (ok"si-môr'fōn), [key] — n. Pharm. a potent semisynthetic morphine-derived narcotic analgesic, CHNO, used as a substitute for morphine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oxymoron oxyneurine Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language