Where does “ost” come from?

ost (Middle English) comes from Old English āst, from Proto-Germanic aistaz, from Proto-Germanic aisǭ, from Proto-Indo-European h₂eydʰ- — to ignite; fire.

Ancestry of “ost”, step by step

StepLanguageWordMeaning
1Old Englishāsta kiln
2Proto-Germanicaistazkiln
3Proto-Germanicaisǭfireplace
4Proto-Indo-Europeanh₂eydʰ-to ignite; fire

Words derived from “ost”

Every word from Proto-Indo-European h₂eydʰ- →Every word from Proto-Germanic aisǭ →Every word from Proto-Germanic aistaz →
ost — Etymology, Origin & Word History | Etymology Explorer