rover

from The Century Dictionary.

• noun A robber, especially a sea-robber; a freebooter; a pirate; a forager.
• noun One who roves; a wanderer; one who rambles about, or goes at random from point to point.
• noun Hence A fickle or inconstant person.
• noun In archery: A person shooting at a mark with a longbow and arrow, or shooting merely for distance, the position of the archer being shifted with every shot, and not confined to a staked-out ground. The flight-arrow was used by the rover.
• noun An arrow used by a rover. See flight-arrow.
• noun An irregular or uncertain point to be aimed at; also, a mark at an uncertain or indefinite distance.
• noun In architecture, any member, as a molding, that follows the line of a curve.
• noun In croquet: A ball that has gone through all the hoops, and 330 only needs to strike the winning-stake to be out of the game.
• noun A player whose ball is in the above condition.
• noun To shoot at random, or without any particular aim.
• To shoot at rovers; shoot arrows at other marks than the butt; shoot for height or distance.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who practices robbery on the seas; a pirate.
• noun One who wanders about by sea or land; a wanderer; a rambler.
• noun Hence, a fickle, inconstant person.
• noun (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.
• noun Casual marks at uncertain distances.
• noun obsolete A sort of arrow.
• noun at casual marks; hence, at random. See def. 5 (a) above.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun archery, usually plural A randomly selected target.
• noun One who roves.
• noun A vehicle for exploring extraterrestrial bodies.
• noun 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').
• noun A pirate or pirate ship.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who leads a wandering unsettled life
• noun an adult member of the Boy Scouts movement