Uosto
Uosto is the genitive singular form of the Lithuanian noun uostas, which means “port” or “harbor.” In Lithuanian grammar, the genitive case is used to indicate possession, association, or relation, and uosto appears in contexts that require this case. A typical example is prie uosto, meaning “by the port” or “near the harbor.” In addition to its use in ordinary sentences, the genitive form uosto is common in toponyms and street names, where it serves to link a place to a harbor or port area, such as in a hypothetical name like Uosto gatvė, rendered as “Port Street.”
Etymology and usage considerations are straightforward within Lithuanian morphology: uosto reflects the standard genitive singular ending
In summary, Uosto is a grammatical form rather than a separate word with its own independent meaning.