The thorax is defined as the part of the body between the head and the abdomen.(noun)
An example of the thorax is where the lungs are located under the ribcage.
See thorax in Webster's New World College Dictionary
Origin: ME < L < Gr thōrax, chest, breastplate
See thorax in American Heritage Dictionary 4
noun pl. tho·rax·es or tho·ra·ces (thôrˈə-sēzˌ, thōrˈ-)
Origin: Middle English
Origin: , from Latin thōrāx, breastplate, chest
Origin: , from Greek.
Learn more about thorax