Definition of Derry
1 city in southeastern New Hampshire southeast of Manchester population 33,109
2 or Londonderryplay \ˌlən-dən-ˈder-ē; ˈlən-dən-ˌder-ē, -d(ə-)rē\ district of northwestern Northern Ireland bordering on the Republic of Ireland; established 1974 area 148 square miles (383 square kilometers), population 108,500
3 or Londonderry port on the Foyle River in northwestern Derry district, Northern Ireland population 62,697
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