A game played in a walled court or against a single wall by two or four players who strike a rubber ball with their hands WordNet 3.0 & Open English WordNet

American handball, known as handball in the United States and sometimes referred to as wallball, is a sport in which players use their hands to hit a small, rubber ball against a wall such that their opponent cannot do the same without the ball touching the ground twice or hitting out-of-bound. Wikipedia

A North American sport played with a small rubber ball Wikipedia Disambiguation

A team sport where two teams of seven players each OmegaWiki

A sport in which players alternately strike the ball against a wall with their hand. Irish and American variants have slightly different rules. Wiktionary

American: sport. Wiktionary (translation)

American: ball. Wiktionary (translation)