thoracic         
adjective  specialized uk/θəˈræs.ɪk/ us/θəˈræs.ɪk/
 medical (人或动物)胸的
in humans and animals, relating to chest
  thoracic surgery 胸腔手术 
 a thoracic surgeon 胸腔手术大夫 
  biology, medical (昆虫)身体中间部分,位于头与腹之间
in insects, relating to the middle part of the body, between the head and the abdomen