| 1. | a ball of clear crystal, glass, or the like, used in crystal gazing. |
| 2. | a method or means of predicting the future. |

| crystal ball n.
|
crystal ball
A means of predicting the future, as in So what does your crystal ball say about the coming election? The term is a figurative use of the crystal or glass ball used by fortune-tellers. [c. 1900]