Delmarva Syllabification: (Del·mar·va)Pronunciation: /delˈmärvə/ (also Delmarva Peninsula)Definition of Delmarva a peninsular region 180 miles (290 km) long in the eastern US that includes Delaware, the Eastern Shore of Maryland, and a small strip of Virginia; it separates Chesapeake Bay from the Atlantic Ocean. Origin:acronym from Delaware, Maryland, and Virginia