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Wiktionary
polocrosse

n. a goal game combining elements of polo, lacrosse, and netball played by teams of six players mounted on horseback and using a sponge rubber ball and a stick with a head like that of a cross and a handle and shaft like those of a polo stick

Wikipedia
Polocrosse

Polocrosse is a team sport that is played all over the world. It is a combination of polo and lacrosse. It is played outside, on a field (the pitch), on horseback. Each rider uses a cane or fibreglass stick to which is attached a racquet head with a loose, thread net, in which the ball is carried. The ball is made of sponge rubber and is approximately four inches across. The objective is to score goals by throwing the ball between the opposing team's goal posts.

Anyone who can ride a horse can play polocrosse, which also helps improve riding skills. All ages and abilities are encouraged to play and the Pony Club have recognised polocrosse as a horse sport.

To get started, players need a recognized safety helmet, a racquet, a ball, leg wraps and coronet boots for the horse.