This is the 5008th most frequent Polish word.
porcelany
"Porcelany" in English means "porcelains" or "china."
Here, 'porcelany' is the genitive case of 'porcelana', used to describe the material the cups are made of.
Te filiżanki z porcelany są bardzo eleganckie.
These porcelain cups are very elegant.
In this sentence, 'porcelany' represents a generic term for porcelain items, and it's in the genitive case because it follows 'kolekcja'.
Znajduje się tam piękna kolekcja porcelany.
There is a beautiful collection of porcelain there.
The word 'porcelany' here is in the genitive case, used to describe the material of the plate.