Where does “fifeldor” come from?

fifeldor (Old English) comes from Old English dor, from Proto-Germanic durz, from Proto-Indo-European dʰwṓr, from Proto-Indo-European dʰwer- — door.

fifeldor (Old English): epithet of the river Eider, the boundary between Holstein and Schleswig

Definitions

  1. epithet of the river Eider, the boundary between Holstein and Schleswig

Ancestry of “fifeldor”, step by step

fifeldor traces back through two separate lines of ancestry.

via Old English dor

StepLanguageWordMeaning
1Old Englishdora large door, a gate
2Proto-Germanicdurzdoor, hatch, flap
3Proto-Indo-Europeandʰwṓrdoor
4Proto-Indo-Europeandʰwer-door

via Old English fīfel

StepLanguageWordMeaning
1Old Englishfīfelmonster, giant
2Proto-Germanicfimfilaz—
Every word from Proto-Indo-European dʰwer- →Every word from Proto-Indo-European dʰwṓr →Every word from Proto-Germanic durz →