Devonport (before 1824 called Plymouth Dock), a parliamentary, municipal, and county borough, maritime town, and naval arsenal, of Devonshire, on the estuary of the Tamar (which is 4 miles long by 1/2 mile broad, and called the Hamoaze), 2 miles WNW. of Plymouth. It stands on high ground, and is separated from its growing suburbs of Stoke and Morice Town by the glacis of its fortifications, once important, but now dismantled. Devonport owes its existence to the dockyard established here by William III. in 1689, and is one of the chief naval arsenals in Britain. The government establishments stretch for nearly 4 miles along the Hamoaze. The original dockyard, extended from time to time until it contained six building-slips, was supplemented in 1844 by the formation at Morice Town of the Keyham Steam Yard and Factory, which communicates with the dockyard and gun-wharf (designed by Vanbrugh) by a tunnel. Farther up the river are an engineers' college, seamen's barracks, magazines, and powder-works; and the Hamoaze itself contains many men-of-war. The official residences of the admiral of the port and of the lieutenant-governor of the western district are at Mount Wise, which is fortified. Here also are the chief barracks of the troops which garrison the 'three towns' of Plymouth, Devonport, and Stonehouse. The military hospital is on Stonehouse Creek. Pop. of municipal borough (1841) 33,820; (1901) 70,437; of parliamentary borough, which includes East Stonehouse, and returns two members, 78,059.