thorax

noun (plural thoraces /ˈθɔːrəsiːz/ or thoraxes)

• the part of the body of a mammal between the neck and the abdomen, including the cavity enclosed by the ribs, breastbone, and dorsal vertebrae, and containing the chief organs of circulation and respiration; the chest.
• Zoology the part of a bird, reptile, amphibian, or fish that corresponds to the human thorax.
• Entomology the middle section of the body of an insect, between the head and the abdomen, bearing the legs and wings.