Where does “Riso” come from?

Riso (Portuguese) comes from Old Portuguese riso, from Latin rīsus, from Ancient Greek ὄρυζα, from Proto-Iranian *wrinǰiš.

Ancestry of “Riso”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	riso	—
2	Latin	rīsus	—
3	Ancient Greek	ὄρυζα	rice
4	Proto-Iranian	*wrinǰiš	—

Riso — Etymology, Origin & Word History | Etymology Explorer