Polo \Po"lo\, n. [Of Eastern origin; -- properly, the ball used in the game.] 1. A game of ball of Eastern origin, resembling hockey, with the players on horseback. [1913 Webster] 2. A similar game played on the ice, or on a prepared floor, by players wearing skates. [1913 Webster] 3. A game similar to hockey played by swimmers. [Webster 1913 Suppl.]