Where does “usos” come from?

usos (Aromanian) comes from Latin ossuōsus, from Latin ōs, from Proto-Italic ōs, from Proto-Indo-European h₃ésth₁ — bone.

usos (Aromanian): bony, osseous

Definitions

Step	Language	Word	Meaning
1	Latin	ossuōsus	—
2	Latin	ōs	—
3	Proto-Italic	ōs	—
4	Proto-Indo-European	h₃ésth₁	bone

usos — Etymology, Origin & Word History | Etymology Explorer