Pneumonia

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early 17th century: via Latin from Greek, from pneumōn ‘lung’.

wiktionary

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From Ancient Greek πνευμονία(pneumonía, “lung disease”), from πνεύμων(pneúmōn, “lung”) + -ία(-ía).

etymonline

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pneumonia (n.)

"inflammation of the tissues of the lungs" (as distinct from the bronchial tubes or the serous covering of the lungs), c. 1600, from Modern Latin, from Greek pneumonia "inflammation of the lungs," from pneumōn "lung" (see pneumo-).