Where does “grindișoară” come from?

grindișoară (Romanian) comes from Romanian grindă, from Proto-Slavic gręda, from Polish Grad, from Proto-Slavic gradъ, from Proto-Indo-European greh₃d-.

Ancestry of “grindișoară”, step by step

Step	Language	Word	Meaning
1	Romanian	grindă	beam; rafter; girder
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 →