pectus excavatum
/ˌpɛktəs ˌɛkskəˈveɪtəm/ /ˌpɛktəs ˌɛkskəˈvɑːtəm/Medicine
noun
Deformity of the chest characterized by displacement of the lower sternum backwards towards the spine.
Origin
Early 20th century; earliest use found in New York Medical Journal. From classical Latin pectus pectus + excavātum, neuter singular of excavātus.