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ball bearing a machine part made of a groove in the shape of a circle with metal balls that roll in it. A ball bearing lets an axle or other part move easily.
beach ball a large, air-filled ball of brightly colored plastic, usually used for games played in or near the water.
crystal ball a globe of glass or crystal used by fortune-tellers to tell what will happen in the future. In stories, crystal balls are often used by witches or wizards.
on the ball acting in a quick and able way. [2 definitions]
soccer ball the round ball used in the game of soccer.
tennis ball the small, round ball used in the game of tennis.