Word:   
Definitions of 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
    Example: "A trackball is essentially an upside-down mouse"

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Search for trackball at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

See trackball used in context: several books and articles.

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