Where does “pneumonia” come from?

pneumonia (New Latin) comes 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.

Ancestry of “pneumonia”, step by step

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

Words derived from “pneumonia”

пневмонија

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