billiard ball

one of the balls used in the game of billiards.

1630–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To billiard ball
Example sentences
The names of several infants are known whose heads have not exceeded in size an
  ordinary billiard ball.
Let's say that a rolling billiard ball is moving toward a glancing collision
  with a stationary billiard ball.
Straight calculus does provide for such a continuous view of the movement of,
  say, a billiard ball.
It gets blasted to pieces even more when the billiard ball explodes.
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