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1650s, from Medieval Latin thoracicus, from Greek thorakikos, from thorax (see thorax).
thoracic tho·rac·ic (thə-rās'ĭk)adj. Of, relating to, or situated in or near the thorax.
transthoracic (trāns'thə-rās'ĭk)adj. Across or through the thoracic cavity or chest wall.