Thoracic \Tho*rac"ic\, a. [Cf. F. thoracique.] (Anat.) Of or pertaining to the thorax, or chest. {Thoracic duct} (Anat.), the great trunk of the lymphatic vessels, situated on the ventral side of the vertebral column in the thorax and abdomen. See Illust. of {Lacteal}.
thoracic duct n : the major duct of the lymphatic system