Where does “ulucaș” come from?

ulucaș (Romanian) comes from Romanian uluc, from Ottoman Turkish اولق, from Proto-Turkic oluk — hollowed-out tree.

Ancestry of “ulucaș”, step by step

StepLanguageWordMeaning
1Romanianulucgroove, gutter
2Ottoman Turkishاولقgutter, conduit, channel, drain
3Proto-Turkicolukhollowed-out tree
Every word from Proto-Turkic oluk →Every word from Ottoman Turkish اولق →Every word from Romanian uluc →