|
|
 |
|
|
|
|
| roll·er·ball [ rṓlər bàwl ] (plural roll·er·balls) |
noun |
|
| Definition: |
| |
1. pen with movable ball tip: a pen with a writing tip in the form of a small movable metal or plastic ball
|
2. ball used instead of computer mouse: a device containing a freely rotating ball that is moved by the fingers to control a cursor on a computer screen
|
|
|
|
