trackball

[trak-bawl]

track·ball

[trak-bawl]
noun
a computer input device for controlling the pointer on a display screen by rotating a ball set inside a case.

Origin:
1975–1980
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Trackball is always a great word to know.
So is ort. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a scrap or morsel of food left at a meal.
Collins
World English Dictionary
trackball or trackerball (ˈtrækˌbɔːl, ˈtrækəˌbɔːl)
 
n
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
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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