Webster's Revised Unabridged Dictionary · 1913

Rover

Rover , noun

[Dutch roover a robber. See Rove, v. i.]

1.
One who practices robbery on the seas; a pirate.
Yet Pompey the Great deserveth honor more justly for scouring the seas, and taking from the rovers 846 sail of ships. — Holland
2.
One who wanders about by sea or land; a wanderer; a rambler.
3.
Hence, a fickle, inconstant person.
4.
(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.
5.
(a) (Archery) Casual marks at uncertain distances. — Encyc. Brit
(b)
A sort of arrow. [Obsolete]
All sorts, flights, rovers, and butt shafts. — B. Jonson
Bound down on every side with many bands because it shall not run at rovers. — Robynson (More's Utopia)