This is the 5622nd most frequent Polish word.
weterynarii
"Veterinary science."
Here, 'weterynarii' is in the genitive case and refers to the field of study.
Studiuję na wydziale weterynarii.
I study at the faculty of veterinary medicine.
In this sentence, 'weterynarii' is in the locative case, used to describe the subject of the book.
Mam książkę o weterynarii.
I have a book about veterinary medicine.
This usage of 'weterynarii' employs the locative case, indicating the area of work desired.