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nerf ball
Any small foam ball, soft and very light, designed for indoor use.
spare ball
(tenpin bowling) The situation where all ten pins are knocked down with the second throw in a frame. The points scored by the next ball rolled (in the next frame) are added to the spare's frame's score.
ball boy
(sports) A person, usually male, responsible for retrieving balls from the area of play, and returning them to the players.
ball sack
ball clay
A type of clay that commonly consists of 20-80% kaolinite, 10-25% mica, and 6-65% quartz.
jack-ball
rugby ball
A spheroidal ball designed for the sport of rugby.
beach ball
A large light inflatable ball, ideally suited to beach games.
tennis ball
A hollow, bouncy rubber ball, pressurized and covered with usually yellow felt, used in the game of tennis.