po·lo 
(pōlō)
(pōlō)n.
1.
a. A game played by two teams of three or four players on horseback who are equipped with long-handled mallets for driving a small wooden ball through the opponents' goal.
b. Water polo.
2. A polo shirt.
[Balti (Tibeto-Burman language of Pakistan), ball; akin to Tibetan (Lhasa dialect) pulu.]
polo·ist n.
polo