This is the 712th most frequent Polish word.
pacjentów
The word "pacjentów" in Polish means "patients" in English (genitive plural form).
In this sentence, 'pacjentami' is the instrumental plural form of 'pacjent', used here to indicate with whom the doctor met.
Lekarz spotkał się z kilkoma pacjentami w przychodni.
The doctor met with several patients in the clinic.
Here, 'pacjentów' is the genitive plural form of 'pacjent', used to qualify the noun 'wielu' (many).
W szpitalu jest wielu pacjentów wymagających specjalistycznej opieki.
There are many patients in the hospital requiring specialized care.
In this sentence, 'pacjentów' is the genitive plural form of 'pacjent', indicating whose health is being monitored.