Definitions for cue ball
Random House Webster's College Dictionary
(in billiards or pool) the usu. white ball a player strikes with the cue, as distinguished from the object balls.
Origin of cue ball:
the ball that the billiard player or pool player strikes with his cue
The white ball which, struck by the cue, collides with the other balls to achieve the object of the particular game.
a bald person