Source : WordNet®

thorax
     n 1: the middle region of the body of an arthropod between the
          head and the abdomen
     2: the part of the human body between the neck and the
        diaphragm or the corresponding part in other vertebrates
        [syn: {chest}, {pectus}]
     3: part of an insect's body that bears the wings and legs
     [also: {thoraces} (pl)]

thoraces
     See {thorax}