From non- + thoracic. <span class="searchmatch">nonthoracic</span> (not comparable) Not thoracic....
extrathoracic interthoracic intrathoracic mesothoracic metathoracic midthoracic <span class="searchmatch">nonthoracic</span> perithoracic scapulothoracic spondylothoracic subthoracic thoracically...