'Thoracic duct' definitions:

Definition of 'thoracic duct'

(from WordNet)
noun
The major duct of the lymphatic system

Definition of 'Thoracic duct'

From: GCIDE
  • Thoracic \Tho*rac"ic\, a. [Cf. F. thoracique.] (Anat.) Of or pertaining to the thorax, or chest. [1913 Webster]
  • 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. [1913 Webster]