IPA: /ˌvɛtəˈrɪnəriən/
KK: /ˌvɛtəˈrɪnɛrɪən/
A person who is trained to take care of animals and treat their illnesses.
The veterinarian examined my dog and gave him a vaccination.
Veterinarian → It is formed from "veteris" (meaning old or experienced) and "-arian" (meaning a person who). The word refers to a person who is experienced in the care of animals, particularly older or domesticated ones.
Think of someone who is 'experienced' ('veteris') in caring for animals — that's what a veterinarian does.