1. (noun)thorax the middle region of the body of an arthropod between the head and the abdomen Synonyms: chest, pectus
2. (noun)thorax, chest, pectus the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates Synonyms: chest, chest of drawers, thorax, dresser, pectus, breast, bureau
3. (noun)thorax part of an insect's body that bears the wings and legs Synonyms: chest, pectus