thoraxes

noun pl. thoraxes or thoraces

1. in tetrapods, including humans,
   1. the part of the body cavity from the neck or head to the abdomen, containing the heart, lungs, etc.; chest: in mammals, the diaphragm separates it from the abdomen
   2. the area of the trunk covering this part
2. in arthropods, the body segment between the head and abdomen to which the legs are attached