Doctor

Doctor was a title used by physicians and the holders of certain advanced university degrees. According to River Song, the word came from the renegade Time Lord known as the Doctor. While the term originally and typically meant "healer" or "wise man," some cultures by the 52nd century used the word to mean "great warrior" due to their fear of the Doctor. It was implied that the word's true origin had been forgotten. (TV: A Good Man Goes to War) By the 45th century, to behave like a doctor was to kill people. (AUDIO: Plague of the Daleks)

The Doctor as a medical doctor
When asked by Polly Wright if his name implied he was a medical doctor, the Second Doctor claimed he graduated in Medicine in 1888 in Glasgow. (TV: The Moonbase) On other occasions, his first (TV: "The Forest of Fear", "Mighty Kublai Khan"), fourth (TV: The Ark in Space), and fifth incarnations claimed not to be a doctor of medicine. (AUDIO: Red Dawn)

In several circumstances, the Doctor let others think his title was to be intended as a physician. mentioned the Doctor's title as being "the man who makes people better". (TV: The Sound of Drums)

First Doctor

 * With the pirate Cherub and his party, who called him "sawbones". (TV: The Smugglers)

Second Doctor

 * With Kirsty McLaren and her sick father, in Scotland, in 1746. (TV: The Highlanders)
 * To enter and rummage the Medical Centre of the Gatwick Airport, in 1966, along with the fake patient Jamie McCrimmon. (TV: The Faceless Ones)

Third Doctor

 * When mistaken for a medical doctor by Claire Forest who was expecting one to visit and take care of Martin Chisom. (AUDIO: Lost in the Wakefield Triangle)

Eleventh Doctor

 * When asked if he was a medical doctor and not just someone with a doctorate in cheese-making, he replied the he was both. (TV: The God Complex)

Behind the scenes

 * The idea that the word "doctor" derives from the Doctor was first advanced by Steven Moffat in a Usenet post in 1995.