1, capital of British Guiana, at the mouth of the Demerara River; is the see of an Anglican bishop; is neatly laid out, and has some handsome buildings, but is considered unhealthy; the staple industries are sugar and coffee. 2, a port of entry in the District of Columbia, on the Potomac, 2 m. NW. of Washington; is a terminus of the Chesapeake and Ohio Canal.