Marston Moor, Battle of Syllabification: (Mars·ton Moor, Bat·tle of)Pronunciation: /ˈmärstən/Definition of Marston Moor, Battle of a battle of the English Civil War, fought in 1644 on Marston Moor near York, in which the Royalists were defeated, fatally weakening Charles I’s cause. Marston Moor, Battle of in other Oxford dictionaries Definition of Marston Moor, Battle of in the British & World English dictionary