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

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

(US, vulgar) Ball-breaker.

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

Alternative form of freeball

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

(sports, snooker) The ball that will take the player's score past the theoretical winning point, even though the frame is not finished and there are still some balls remaining on the table.

(sports, billiards, snooker, pool) A ball that is in the jaws of a pocket

(sports, billiards, snooker, pool) Describes a shot where the cue ball and the object ball make contact at a natural 45º angle.

Dated form of baseball. (ball game)