Where does “Kostruh” come from?

Kostruh (Czech) comes from Czech kostra, from Proto-Slavic *kostra, from Proto-Slavic kostь, from Proto-Indo-European kost-.

Ancestry of “Kostruh”, step by step

StepLanguageWordMeaning
1Czechkostraskeleton
2Proto-Slavic*kostra—
3Proto-Slavickostьbone
4Proto-Indo-Europeankost-—
Every word from Proto-Indo-European kost- →Every word from Proto-Slavic kostь →Every word from Proto-Slavic *kostra →