noun
1. game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks
• Syn: ↑jack
• Hypernyms: ↑game equipment
2. a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball
• Syn: ↑jacks, ↑knucklebones
• Hypernyms: ↑child's game
Useful english dictionary. 2012.