/ Dictionary / Index M Merrimack: Meaning and Definition of Find definitions for: Mer•ri•mack Pronunciation: (mer'u-mak"), [key] — n. a town in S New Hampshire. 15,406. a river in central New Hampshire and NE Massachusetts, flowing S and NE to the Atlantic. 110 mi. (175 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: merrimack (Thesaurus) Merrimac* merriment Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language