Where does “þvǫ́ttr” come from?

þvǫ́ttr (Old Norse) comes from Proto-Germanic þwahtuz, from Proto-Germanic -þuz, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Ancestry of “þvǫ́ttr”, step by step

StepLanguageWordMeaning
1Proto-Germanicþwahtuzwashing, laundry
2Proto-Germanic-þuzForms result nouns from verb roots, usually from...
3Proto-Indo-European-tusDerives action nouns from verb roots

Words derived from “þvǫ́ttr”

Every word from Proto-Indo-European -tus →Every word from Proto-Germanic -þuz →Every word from Proto-Germanic þwahtuz →