Water Polo is a form of polo played in a swimming pool. Players advance a ball across a pool with the intention of throwing it into the opposing team's goal.

Water polo is a team game played with six position players and one goalkeeper per team. The team with possession of the ball attacks the opposing team's goal to try to score. Play is continuous unless a goal is scored or a penalty is committed.

The goal of water polo is to score more points than the opposing team at the end of regulation.

At the start of play, both teams line up along their own goal and sprint to the middle of the pool at the referees whistle in order to gain control of the ball. The attacking team then attempts to score on the opposing team's goal and maintains control until they score or turn the ball over. Once a goal is scored, teams line up on their own half of the pool and the team who did not score the previous goal gets possession; play begins when that team puts the ball in play by passing to a teammate.

Water polo originated in the late 19th century as a form of rugby played in rivers and lakes in England and Scotland with a ball made of Indian rubber. The name polo is derived from the Balti word for ball, pulu. In 1900, water polo was included in the Olympic Games becoming the first team sport to be included in the event.

Ball
Caps
Goals
Pool

Water polo is a sport that requires participants to be able to swim. Players must constantly swim from one end of the pool to the other throughout the game, so good swimming ability is necessary. Players must also be able to tread water. Since rules state that players can only have one hand on the ball, they must be able to catch and throw with either hand.

Attacking Team - team having control of the ball, trying to score a goal

Ball Under - taking or holding the ball underwater when, through body contact, the player in possession is either forced to take the ball underwater or while purposefully taking the ball underwater.

Brutality - when a player deliberately goes out of the way to hit, kick, or strike towards an opposing player

Corner Throw - a free throw taken by the closest player on the offensive team on the 2-yard marker by the side of the pool where the defensive team has caused the ball to pass over the goal line

Dead Time - time lapse that occurs between the awarding of a free pass and when the ball is actually put into play

Double Foul - a foul occurring when players on opposing teams commit a rule violation at the same time

Dry Pass - pass when ball does not touch the water

Face-Off - when a player from each team lines up side-by-side, facing the referee, and race for the ball once it is dropped in the water

Hole - the area anywhere inside the penalty throw zone where the 2-meter man sets up offensive play

Penalty Throw - a direct shot at the goal by an offensive player on command of the referee from a distance of four meters from the goal

Slough - when a defender drops off the offensive player to help guard the hole, usually looking to steal the bad pass

Strong Side - side of the pool where the ball is

Weak Side - side of the pool where the ball is not

Wet Pass - ball passed on the water

http://en.wikipedia.org/wiki/Water_polo#History
http://www.rewp.net/glossary.htm