rover (n.) Look up rover at Dictionary.com
late 14c., "sea-robber, pirate," from Middle Dutch rover "robber, predator, plunderer," especially in zeerovere "pirate," literally "sea-robber," from roven "to rob," from Middle Dutch root "spoil, plunder," related to Old English reaf "spoil, plunder," reafian "to reave" (see reft).