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trackball

[trak-bawl] /ˈtrækˌbɔl/
noun
1.
a computer input device for controlling the pointer on a display screen by rotating a ball set inside a case.
Origin
1975-1980
1975-1980
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for track ball

trackball

/ˈtrækˌbɔːl/
noun
1.
(computing) a device consisting of a small ball, mounted in a cup, which can be rotated to move the cursor around the screen
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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track ball in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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