thorax

The part of the human body between the neck and the diaphragm, partially encased by the ribs and containing the heart and lungs; the chest.

A part in other vertebrates that corresponds to the human thorax.

The second or middle region of the body of certain arthropods, including the insects and most crustaceans, lying between the head and the abdomen.

In anatomy and zoology, a part of the trunk between the head or neck and the abdomen or tail, in any way distinguished, as by containing the heart and lungs, by being inclosed with large ribs, or by bearing certain limbs not borne elsewhere.

In entomology, that part of the body which is situated between the head and the abdomen, and in adult insects alone bears the wings and legs, when there are any..