1911 Encyclopædia Britannica/Thorax

THORAX (Gr. θώραξ, breastplate, also the part of the body covered by it), the anatomical term for the chest, that part of the body which contains the heart and lungs (see Anatomy: Superficial and Artistic, and Skeleton: Axial). For the surgery of the thorax reference may be made to the headings Heart, Lung and Respiratory System.