Where does “peretreo” come from?

peretreo (Old English) comes from Latin pyrethrum, from Ancient Greek πύρεθρον, from Ancient Greek πῦρ, from Proto-Indo-European péh₂wr̥ — bonfire; spelt.

Ancestry of “peretreo”, step by step

Step	Language	Word	Meaning
1	Latin	pyrethrum	—
2	Ancient Greek	πύρεθρον	pellitory of Spain
3	Ancient Greek	πῦρ	a fire; lightning; a fever
4	Proto-Indo-European	péh₂wr̥	bonfire; spelt

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