This is the 13660th most frequent Swedish word.
veterinären
"The veterinarian."
Here, 'veterinären' is a noun used in a definite form, referring to a specific veterinarian who is performing the examination.
Veterinären undersöker min katt.
The veterinarian is examining my cat.
In this sentence, 'veterinären' is again a noun in the definite form, used to refer to the person within a professional context.
Jag ringde veterinären för råd om min hunds hälsa.
I called the veterinarian for advice on my dog's health.
Here, 'veterinär' refers to the profession or role in a general sense, and it is used in the indefinite form ('en veterinär').