Where does “rost” come from?

rost (Old French) comes from Old French rostir, from Frankish rōstjan, from Proto-Germanic raustijaną, from Proto-Indo-European *Hrews-.

Ancestry of “rost”, step by step

StepLanguageWordMeaning
1Old Frenchrostirto roast; to torture by subjecting to fire
2Frankishrōstjanto roast
3Proto-Germanicraustijanąto roast
4Proto-Indo-European*Hrews-—

Words derived from “rost”

Every word from Proto-Indo-European *Hrews- →Every word from Proto-Germanic raustijaną →Every word from Frankish rōstjan →