Trackball

A trackball is a pointing device consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axes—like an upside-down mouse with an exposed protruding ball. The user rolls the ball with the thumb, fingers, or the palm of the hand to move a pointer. Compared with a mouse, a trackball has no limits on effect...
Found on http://en.wikipedia.org/wiki/Trackball

trackball

(from the article `computer`) Mechanical mice and trackballs operate alike, using a rubber or rubber-coated ball that turns two shafts connected to a pair of encoders that measure ...
Found on http://www.britannica.com/eb/a-z/t/68

trackball

noun an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen; `a trackball is essentially an upside-down mouse`
Found on https://www.encyclo.co.uk/local/20974

Trackball

A mouse alternative that is basically an upside-down mouse. Useful for some people with mobility impairments because it isolates pointer movement from button clicking.
Found on https://www.washington.edu/doit/glossary-disability-related-terms

trackball

An encoder at the ACNET consoles which allows the user to change the (x,y) position of the cursor on the TV and AEOLUS screens.
Found on http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A

trackball

Input device that carries out the same function as a mouse, but remains stationary. In a trackball the ball controlling the cursor position is operated directly with the fingers
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0044594.html

trackball

[n] - an electronic device consisting of a rotatable ball in a housing
Found on http://www.webdictionary.co.uk/definition.php?query=trackball
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