In Russian, the word “doctor” shares the root with the word “liar.”
This happens because “to lie” and “to talk” were originally the same word. A doctor, in the early Middle Ages, was a person who talked to you and tried to talk the illness away.
And then some people say that talk therapy is a modern invention.
Clarissa's Blog 
Of course, in Latin, ‘doctor’ means ‘teacher’. I know professors who, because of this, refuse to use the title Dr. for medical practitioners. They use it only for academics.
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Ah! This makes a lot of sense.
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