Definitions for water polo
Random House Webster's College Dictionary
an aquatic game played by two teams of seven swimmers each, the object being to score goals by pushing, carrying, or passing an inflated ball and tossing it into the opponent's goal, defended by a goalkeeper.
Origin of water polo:
a game played in a swimming pool by two teams of swimmers who try to throw an inflated ball into the opponents' goal
A water sport consisting of two teams of swimmers who have to throw the ball into the opponents goal.