a computer input device for controlling the pointer on a display screen by rotating a ball set inside a case.

1975–1980 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trackball or trackerball (ˈtrækˌbɔːl, ˈtrækəˌbɔːl)
computing a device consisting of a small ball, mounted in a cup, which can be rotated to move the cursor around the screen
trackerball or trackerball

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Manufacturers introduced the trackball, based on the same technology, as an
  alternative to the mouse on laptop computers.
Dorothy is controlled entirely with the touchscreen, which has a virtual
  emerald trackball on it.
The pointing device is a trackball that does not fit on the keyboard platform.
The keyboard and trackball shall allow for either left or right handed use.
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