Where does “os” come from?

os (Guinea-Bissau Creole) comes from Portuguese osso, from Old Portuguese osso, from Latin ossum, from Latin ōs, from Proto-Italic ōs, from Proto-Indo-European h₃ésth₁ — bone.

os (Guinea-Bissau Creole): bone

Definitions

bone

Ancestry of “os”, step by step

Step	Language	Word	Meaning
1	Portuguese	osso	bone; a difficulty; difficult
2	Old Portuguese	osso	Alternative form of usso
3	Latin	ossum	bone; kernel, stone
4	Latin	ōs	mouth
5	Proto-Italic	ōs	mouth
6	Proto-Indo-European	h₃ésth₁	bone

Every word from Proto-Indo-European h₃ésth₁ →Every word from Proto-Italic ōs →Every word from Latin ōs →