Definitions for "TRACK BALL"
A computer input device. Like a mouse turned upside down, it has a ball of 2" to 3" in diameter halfway enclosed in a box like base. The user rolls this ball in its socket which is translated by a mechanism into movement of a pointer on the computer screen. There is a button beside this ball that is clicked to execute computer functions.
An input device used in place of a mouse. It has a large ball that is moved with the fingers to direct the cursor movement.
An input device used in place of a mouse which has a ball that is moved with the fingers to direct the movement of the cursor on the computer screen.