[ 'θɔ:raks ]
■ noun ( plural thoraces 'θɔ:rəsi:z or ~es ) Anatomy & Zoology 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.
↘ Zoology the corresponding part of a bird, reptile, amphibian, or fish.
↘ Entomology the middle section of the body of an insect, between the head and the abdomen, bearing the legs and wings.
Origin
ME: via L. from Gk thōrax .