A doctor is a person that has succeeded in research-related postgraduate studies of an extended period. Also known as a "doctor of philosophy".
Some professions such as medical practitioners, dentists, chiropractors and optometrists have more recently corrupted use of the term for their own personal ends.
"I am a doctor."
"Good, can you help me with my ingrown toenails?"
"No sorry, I'm a REAL doctor."
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