a computer input device for controlling the pointer on a display screen by rotating a ball set inside a case.
Origin of trackball
First recorded in 1975–1980
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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