bowling ball

noun
a round, heavy ball for bowling, usually made of hard rubber or plastic, with holes drilled into it for the bowler's thumb and two fingers.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Think in terms of the rubber sheet description of gravity, with the bowling
  ball deforming the sheet.
Nor would the fact that you don't know the difference between a astronomical
  spheroid and a bowling ball.
In theory, there is no limit to how precise and powerful a bowling ball could
  be made.
The bowling ball's weight deforms the medium of the mattress, and the deformed
  medium influences the marble's movement.
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