polo ball
Noun
Meaning
wooden ball that is struck with mallets in playing polo
Source: WordNetHypernyms
Examples
Items required in water polo include: *Ball: A water polo ball is constructed of waterproof material to allow it to float on the water.
The only piece of equipment required by the United States Polo Association (USPA) rules is the helmet or cap with a chin strap. citation The outdoor polo ball is made of a high-impact plastic, but was formerly made of either bamboo or willow root.
The museum also displays a "night polo ball" with a rotating platform on which a candle is placed.
The present-day game involves teams of seven players (plus up to six substitutes), with a water polo ball similar in size to a soccer ball but constructed of waterproof nylon.