Wordnet 3.0
NOUN (1)
1. 
 a river in the east central United States; 
 rises in West Virginia in the Appalachian Mountains and flows eastward, forming the boundary between Maryland and Virginia, to the Chesapeake Bay; 
[syn: Potomac, Potomac River]
WordNet (r) 3.0 (2006):
Potomac River
    n 1: a river in the east central United States; rises in West
         Virginia in the Appalachian Mountains and flows eastward,
         forming the boundary between Maryland and Virginia, to the
         Chesapeake Bay [syn: Potomac, Potomac River]