Where does “бездъна” come from?

бездъна (Old Church Slavonic) comes from Old Church Slavonic дъно, from Proto-Slavic dъno, from Proto-Indo-European *dʰewb-.

бездъна (Old Church Slavonic): abyss

Definitions

  1. abyss

Ancestry of “бездъна”, step by step

бездъна traces back through 3 separate lines of ancestry.

via Old Church Slavonic дъно

StepLanguageWordMeaning
1Old Church Slavonicдъноbottom
2Proto-Slavicdъnobottom
3Proto-Indo-European*dʰewb-—

via Old Church Slavonic без

StepLanguageWordMeaning
1Old Church Slavonicбезwithout
2Proto-Slavicbezwithout
3Proto-Indo-European*bʰeǵʰs—

via Proto-Slavic bezdъna

StepLanguageWordMeaning
1Proto-Slavicbezdъnaabyss

Words derived from “бездъна”

Every word from Proto-Indo-European *dʰewb- →Every word from Proto-Slavic dъno →Every word from Old Church Slavonic дъно →