Look up: trackball

1. trackball
   [n] - an electronic device consisting of a rotatable ball in a housing
   Found on http://www.webdictionary.co.uk/definitio
   
   
2. 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 http://wordnetweb.princeton.edu/perl/web
   
   
3. 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
   
   
4. 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/acc
   
   
5. 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/ency
   
   
6. Trackball
   Expert Mouse trackball can use a standard American pool ball 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 ...
   Found on http://en.wikipedia.org/wiki/Trackball