Where does “hrádek” come from?

hrádek (Czech) comes from Czech hrad, from Proto-Slavic gręda, from Polish Grad, from Proto-Slavic gradъ, from Proto-Indo-European greh₃d-.

Ancestry of “hrádek”, step by step

StepLanguageWordMeaning
1Czechhradcastle
2Proto-Slavicgrędagarden bed; beam
3PolishGrad—
4Proto-Slavicgradъhail
5Proto-Indo-Europeangreh₃d-—
Every word from Proto-Indo-European greh₃d- →Every word from Proto-Slavic gradъ →Every word from Polish Grad →