/ Dictionary / Index T thoracotomy: Meaning and Definition of Find definitions for: tho•ra•cot•o•my Pronunciation: (thôr"u-kot'u-mē, thōr"-), [key] — pl. -mies. incision into the chest cavity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thoracotomy (Thesaurus) thoracostomy thorax Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language