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Meaning of object ball

ob'ject ball"

Pronunciation: [key]
— Billiards, Pool. Billiards,Pool.
  1. the first ball struck by the cue ball in making a carom. Cf.
  2. a ball to be struck by the cue ball; any ball except the cue ball.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.