This is the 14163rd most frequent Polish word.
pralki
"Pralki" means "washing machines" in English.
Here, 'pralki' is the plural form of 'pralka', meaning 'washing machines'.
Potrzebuję nowych pralki do mojej pralni.
I need new washing machines for my laundry.
In this context, 'pralki' is in the genitive case, indicating possession or relation: 'of the washing machine'.
Przyjrzałem się dokładnie działaniu tej pralki.
I closely examined the operation of this washing machine.
Here, 'pralki' is used in the singular genitive form, after the word indicating a negative sentence: 'I don't see'.