THORACIC is a 8 letter word that starts with T.

1. \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}.
   
   

2. \Tho*rac"ic\, n. [Cf. F. thoracique.] (Zo["o]l.)
   One of a group of fishes having the ventral fins placed
   beneath the thorax or beneath the pectorial fins.