/ Dictionary / Index M Merca: Meaning and Definition of Find definitions for: Mer•ca Pronunciation: (mer'kä), [key] — n. a city in S Somalia. 50,000. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. merc mercado* Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language