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WordNet records no synonym and no antonym for trackball. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
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”
Synonyms, antonyms and the broader and narrower relations for trackball come from Princeton University’s WordNet. Full sources and licences.