a national park on an island in Michigan; includes prehistoric iron mines | the government agency in the United Kingdom that is responsible for internal security and counterintelligence on British territory |
| the government agency in the United Kingdom that is responsible for internal security and counterintelligence overseas |
| a midwestern state in north central United States in the Great Lakes region, with capital Lansing |
| destruction of heart tissue resulting from obstruction of the blood supply to the heart muscle |