Rover

Middle English roven ("to wander, to shoot an arrow randomly")

Noun

1. (archery, usually plural) A randomly selected target.1890 "By my hilt! no. There was little Robby Withstaff, and Andrew Salblaster, and Wat Alspaye, who broke the neck of the German. Mon Dieu! what men they were! Take them how you would, at long butts or short, hoyles, rounds, or rovers, better bowmen never twirled a shaft over their thumb-nails." — Arthur Conan Doyle, The White Company, Chapter 22.
2. One who roves, a wanderer, a nomad.1846 But these islands, undisturbed for years, relapsed into their previous obscurity; and it is only recently that anything has been known concerning them. Once in the course of a half century, to be sure, some adventurous rover would break in upon their peaceful repose. and astonished at the unusual scene, would be almost tempted to claim the merit of a new discovery. — Herman Melville, Typee, Chapter 1.
3. A vagabond, a tramp, an unsteady, restless person, one who by habit doesn't settle down or marry.She is a rover and dislikes any sort of ties, physical or emotional.1954 Give him the word, that I'm not a rover, and tell him that his lonely days are over. Mr. Sandman, song by , recorded by
4. A vehicle for exploring extraterrestrial bodies.The Mars Exploration Rovers will act as robot geologists while they are on the surface of Mars. NASA site.
5. Position in Australian Rules football, one of three of a team's followers, who follow the ball around the ground. Formerly a position for short players, rovers in professional leagues are frequently over 183 cm (6').
6. (croquet) A ball which has passed through all the hoops and would go out if it hit the stake but is continued in play; also, the player of such a ball.
7. (obsolete) A sort of arrow.
• Ben JonsonAll sorts, flights, rovers, and butt shafts.

From Middle Dutch, roven, to rob. Cognate with Danish and Norwegian røver ("robber, thief, highwayman, brigand"), Swedish rövare

Full definition of rover

Noun

1. A pirate or pirate ship.1719 The first was this: our ship making her course towards the Canary Islands, or rather between those islands and the African shore, was surprised in the grey of the morning by a Turkish rover of Sallee, who gave chase to us with all the sail she could make. — Daniel Defoe, Robinnson Crusoe, Chapter 2.
• HollandYet Pompey the Great deserveth honour more justly for scouring the seas, and taking from the rovers 846 sail of ships.----