Where does “plùrāl” come from?

plùrāl (Serbo-Croatian) comes from Latin plūrālis, from Latin plūs, from Old Latin plous, from Proto-Indo-European ploh₁is-.

Ancestry of “plùrāl”, step by step

Step	Language	Word	Meaning
1	Latin	plūrālis	—
2	Latin	plūs	—
3	Old Latin	plous	—
4	Proto-Indo-European	ploh₁is-	—

plùrāl — Etymology, Origin & Word History | Etymology Explorer