/ Dictionary / Index T trackball: Meaning and Definition of Find definitions for: track•ball Pronunciation: (trak'bôl"), [key] a computer input device for controlling the pointer on a display screen by rotating a ball set inside a case. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: trackball (Thesaurus) track and field track brake Related Content Daily Word Quiz: anecdote Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language