Where does “ребриште” come from?

ребриште (Macedonian) comes from Macedonian ребро, from Proto-Slavic rebrò, from Proto-Balto-Slavic *rébran, from Proto-Indo-European h₁rebʰ- — to cover, to roof; rib.

Ancestry of “ребриште”, step by step

StepLanguageWordMeaning
1Macedonianреброrib
2Proto-Slavicrebròrib
3Proto-Balto-Slavic*rébranrib
4Proto-Indo-Europeanh₁rebʰ-to cover, to roof; rib
Every word from Proto-Indo-European h₁rebʰ- →Every word from Proto-Balto-Slavic *rébran →Every word from Proto-Slavic rebrò →