/ Dictionary / Index M metoprolol: Meaning and Definition of Find definitions for: met•o•pro•lol Pronunciation: (met"ō-prō'lôl, -lol), [key] — n. Pharm. a beta blocker, CHNO, used in the treatment of hypertension, angina, and cardiac arrhythmias. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: metoprolol (Thesaurus) metopic metr- Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language