This is the 2936th most frequent Polish word.
narządów
"Narządów" means "of organs" in English.
The word 'narządów' is used here in the genitive plural form, indicating parts of a system consisting of various organs.
Układ narządów człowieka jest niezwykle skomplikowany.
The human organ system is extremely complex.
In this sentence, 'narządów' indicates multiple organs in the context of medical transplantation, again in the genitive plural form.
Lekarz zajmuje się transplantacją narządów.
The doctor specializes in organ transplantation.
Here, 'narządów' is used to refer to internal organs collectively as a category of body parts, in genitive plural form.