A ballpoint pen.

One who attends a ball.

plural of ball-goer

(historical) A muzzle-loading bullet with a hollow base, much used in the second half of the nineteenth century.

(snooker) A situation in which a player can play on any ball desired when snookered after a foul shot; also, that desired ball.

A suspended rotating mirrored sphere which casts moving spots of light across a room when light is projected on it.

Dated form of baseball. (ball game)

In billiards, a circumstance in which a fault by another player, such as a scratch, permits the competitor to take the cue ball in hand and place it anywhere on the table.

plural of ball bearing

(engineering) A bearing assembly which uses spherical bearing balls as the rolling elements.