Where does “pneumonia” come from?

pneumonia (Portuguese) comes from Medieval Latin pneumonia, from Ancient Greek πνευμονία, from Ancient Greek πνεύμων, from Ancient Greek πλεύμων, from Proto-Indo-European pléwmō, from Proto-Indo-European plew- — to fly, flow, run.

pneumonia (Portuguese): pneumonia

Definitions

pneumonia

Ancestry of “pneumonia”, step by step

Step	Language	Word	Meaning
1	Medieval Latin	pneumonia	—
2	Ancient Greek	πνευμονία	a disease of the lungs
3	Ancient Greek	πνεύμων	lung; kind of a mollusk
4	Ancient Greek	πλεύμων	lung
5	Proto-Indo-European	pléwmō	lung, floater
6	Proto-Indo-European	plew-	to fly, flow, run

Every word from Proto-Indo-European plew- →Every word from Proto-Indo-European pléwmō →Every word from Ancient Greek πλεύμων →