Where does “osta” come from?

osta (Latvian) comes from Proto-Indo-European h₁óh₃s, from Proto-Indo-European h₁óh₃-s ~ h₁éh₃-s.

osta (Latvian): port, harbor

Definitions

Step	Language	Word	Meaning
1	Proto-Indo-European	h₁óh₃s	mouth
2	Proto-Indo-European	h₁óh₃-s ~ h₁éh₃-s	—

osta — Etymology, Origin & Word History | Etymology Explorer