Where does “*nædher” come from?

*nædher (Old Swedish) comes from Old Norse naðr, from Proto-Germanic nadrǭ, from Proto-Indo-European néh₁treh₂.

Ancestry of “*nædher”, step by step

StepLanguageWordMeaning
1Old Norsenaðrsnake
2Proto-Germanicnadrǭadder; snake in general
3Proto-Indo-Europeannéh₁treh₂—
Every word from Proto-Indo-European néh₁treh₂ →Every word from Proto-Germanic nadrǭ →Every word from Old Norse naðr →