Where does “храсталак” come from?

храсталак (Bulgarian) comes from Bulgarian храст, from Proto-Slavic xvorstъ, from Proto-Balto-Slavic kšwáršta, from Proto-Indo-European (s)kworstom.

Ancestry of “храсталак”, step by step

StepLanguageWordMeaning
1Bulgarianхрастbush, frutex, shrub
2Proto-Slavicxvorstъbrushwood
3Proto-Balto-Slavickšwáršta
4Proto-Indo-European(s)kworstom—
Every word from Proto-Indo-European (s)kworstom →Every word from Proto-Balto-Slavic kšwáršta →Every word from Proto-Slavic xvorstъ →