/ Dictionary / Index T thoracic: Meaning and Definition of Find definitions for: tho•rac•ic Pronunciation: (thô-ras'ik, thō-), [key] — adj. of or pertaining to the thorax. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thoracic (Thesaurus) thoracentesis thoracic artery Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language