trackball /ˈtrækˌbɑːl/ noun plural trackballs
plural trackballs
Learner's definition of TRACKBALL
[count] computers
: a device which consists of a small ball that you roll with your fingers to control the movement of a pointer on a computer screen跟踪球(用手指旋转,以控制电脑显示屏上光标移动的装置)