This is the 902nd most frequent Polish word.
dużych
The Polish word "dużych" means "large" or "big" in the genitive or locative plural form.
In this sentence, 'dużych' is an adjective meaning 'big' and is used in the plural, locative form to describe 'parkach' (parks).
Lubię spacery po dużych parkach.
I like walks in big parks.
Here, 'dużych' serves as a plural adjective meaning 'large,' agreeing with the genitive plural form of 'sal' (rooms).
Potrzebujemy dużych sal na konferencje.
We need large rooms for the conferences.
In this context, 'dużych' functions as a plural adjective in the genitive case, describing 'miast' (cities).