polskich
Polskich is a form of the Polish adjective polski meaning “Polish.” It is the genitive plural ending used to modify plural nouns and, in some grammatical contexts, the accusative plural for masculine personal nouns. In Polish grammar, adjectives decline for gender, number, and case, and polskich appears in plural forms when describing something associated with Poland or Polish origin.
In everyday usage, polskich is most commonly seen in phrases that denote origin, nationality, or characteristic
Polskich is thus a key inflected form of polski used to express possession or relation in plural