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German word Arzt comes from Ancient Greek ἰατρός, Ancient Greek ἀρχι-, and later Latin archiater (Physician, especially a chief physician of a ruler.)
ἰατρός (Ancient Greek)
ἀρχι- (Ancient Greek)
ἀρχίατρος (Ancient Greek)
archiater (Latin)
Physician, especially a chief physician of a ruler.
arzat (Old High German)
arzet (Middle High German)
Arzt (German)
Doctor, physician (without necessarily having a postgraduate degree).