Where does “clăișoară” come from?

clăișoară (Romanian) comes from Romanian claie, from Proto-Slavic kladňa.

Ancestry of “clăișoară”, step by step

Step	Language	Word	Meaning
1	Romanian	claie	haystack; heap, pile; a bunch, mass, multitude,...
2	Proto-Slavic	kladňa	—