billiard ball

noun
one of the balls used in the game of billiards.

Origin:
1630–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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