Definitions for trackballˈtrækˌbɔl
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Random House Webster's College Dictionary
track•ballˈtrækˌbɔl(n.)
a computer input device for controlling the pointer on a display screen by rotating a ball set inside a case.
Category: Computers
Origin of trackball:
1965–70
Princeton's WordNet
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"
Wiktionary
trackball(Noun)
A pointing device consisting of a ball housed in a socket
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