Where does “Dolu” come from?

Dolu (Romanian) comes from Old Church Slavonic долъ, from Proto-Slavic dolъ, from Proto-Indo-European dʰal-.

Ancestry of “Dolu”, step by step

StepLanguageWordMeaning
1Old Church Slavonicдолъvalley
2Proto-Slavicdolъvalley; depression, pit
3Proto-Indo-Europeandʰal-—
Every word from Proto-Indo-European dʰal- →Every word from Proto-Slavic dolъ →Every word from Old Church Slavonic долъ →