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