Source : WordNet®

Potomac
     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 River}]
     2: terms sometimes used to refer to Washington, D.C. [syn: {Foggy
        Bottom}]