This is the 14555th most frequent Polish word.
przychodni
"Przychodni" means "clinic" or "outpatient clinic" in English.
The word 'przychodni' is used here as the locative form of 'przychodnia,' indicating a place (clinic) where the action (being there) took place.
Wczoraj byłem w przychodni na badania lekarskie.
Yesterday, I was at the clinic for medical tests.
In this sentence, 'przychodnię' is the accusative form of 'przychodnia' used to denote the clinic referred to as a direct object of the recommendation.
Polecam tę przychodnię, ponieważ mają świetnych specjalistów.
I recommend this clinic because they have excellent specialists.
Here, 'przychodni' is the dative form of 'przychodnia,' used to indicate possession or the recipient of the new medical equipment.