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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 track·ball /ˈtrækˌbɔl/
 軌跡球

From: WordNet (r) 2.0

 trackball
      n : 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"