noun Billiards, Pool.
Origin of object ball
Examples from the Web for object ball
If the striker's ball is holed he plays from baulk; if an object-ball, it is spotted as at the beginning of the game.
The side-stroke is made by striking the object-ball on the side with the point of the cue.
A number of similar strokes could thus be made before the object-ball was out of position.