Marston Moor mars·ton·moor uncommon noun 1. a battle in 1644 in which the Parliamentarians under the earl of Manchester defeated the Royalists under Prince Rupert SynonymsMarston Moorbattle of Marston Moor Related words Broader terms pitched battle Parts English Civil War WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.