Where does “dźwiérka” come from?

dźwiérka (Polish) comes from Polish dźwierze, from Old Polish dźwirze, from Proto-Slavic dvь̃rь, from Proto-Balto-Slavic dwírs, from Proto-Indo-European dʰwer- — door.

Ancestry of “dźwiérka”, step by step

StepLanguageWordMeaning
1Polishdźwierze—
2Old Polishdźwirze—
3Proto-Slavicdvь̃rьdoor
4Proto-Balto-Slavicdwírsdoor
5Proto-Indo-Europeandʰwer-door
Every word from Proto-Indo-European dʰwer- →Every word from Proto-Balto-Slavic dwírs →Every word from Proto-Slavic dvь̃rь →