Where does “gerendák” come from?

gerendák (Hungarian) comes from Hungarian gerenda, from Proto-Slavic gręda, from Polish Grad, from Proto-Slavic gradъ, from Proto-Indo-European greh₃d-.

Ancestry of “gerendák”, step by step

Step	Language	Word	Meaning
1	Hungarian	gerenda	beam; plough beam
2	Proto-Slavic	gręda	garden bed; beam
3	Polish	Grad	—
4	Proto-Slavic	gradъ	hail
5	Proto-Indo-European	greh₃d-	—

Every word from Proto-Indo-European greh₃d- →Every word from Proto-Slavic gradъ →Every word from Polish Grad →