from The American Heritage® Dictionary of the English Language, 4th Edition
- A river rising in south-central New Hampshire and flowing about 177 km (110 mi) south into northeast Massachusetts then northeast to the Atlantic Ocean. It was long used as a source of power for textile mills.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a river that rises in south central New Hampshire and flows through Concord and Manchester into Massachusetts and empties into the Atlantic Ocean
Sorry, no etymologies found.
This ferry was as busy as a beaver dam, and all the world seemed anxious to get across the Merrimack River at this particular point, waiting to get set over, -- children with their two cents done up in paper, jail-birds broke loose and constable with warrant, travellers from distant landsto distant lands, men and women to whom the Merrimack River was a bar.