Where does “pijesak” come from?

pijesak (Serbo-Croatian) comes from Proto-Slavic pěsъkъ, from Proto-Indo-European pē(n)s-u-ko-.

Ancestry of “pijesak”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	pěsъkъ	sand
2	Proto-Indo-European	pē(n)s-u-ko-	—

pijesak — Etymology, Origin & Word History | Etymology Explorer