Where does “pyrexia” come from?

pyrexia (Latin) comes from Ancient Greek πυρεξία, from Ancient Greek πυρετός, from Ancient Greek πῦρ, from Proto-Indo-European péh₂wr̥ — bonfire; spelt.

Ancestry of “pyrexia”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πυρεξία	feverishness
2	Ancient Greek	πυρετός	heat; fever
3	Ancient Greek	πῦρ	a fire; lightning; a fever
4	Proto-Indo-European	péh₂wr̥	bonfire; spelt

Words derived from “pyrexia”

pyrexia
hyperpyrexia
pyrexial
apyrexia
pyrexic
antipyrexial
hypopyrexia
hyperpyrexic
hypopyrexial

Every word from Proto-Indo-European péh₂wr̥ →Every word from Ancient Greek πῦρ →Every word from Ancient Greek πυρετός →