adjective of or relating to the thorax. QUIZ Question TAKE THE QUIZ TO FIND OUT Also tho·ra·cal [thawr-uh-kuhl, thohr-]. Origin of thoracic 1650–60; <Medieval Latin thōrācicus <Greek thōrākikós. See thorac-, -ic OTHER WORDS FROM thoracic non·tho·rac·ic, adjective post·tho·rac·ic, adjective pre·tho·rac·ic, adjective sub·tho·ra·cal, adjective