Medicine
The word medicine came from the Latin word for healing. (AUDIO: The Sleeping Blood)
The First Doctor was a medical student for two years, during which he took the Hippocratic Oath. He gave up his studied and instead chose to specialise in science, but he did not forget his oath. (AUDIO: Farewell, Great Macedon)
Liz Shaw had a degree in medicine. (TV: Spearhead from Space) Vicki Pallister studied medicine at the age of ten for an hour a week using a machine. (TV: The Web Planet)
The Tenth Doctor described medicine as an ongoing war. Treatments evolved and progressed, but so too did the viruses. (TV: New Earth)
When the Tenth Doctor arrived on the planet Malcassairo in the year 100 trillion, he announced that he was called "the Doctor". Professor Yana asked if his doctorate was in medicine, to which the Doctor replied that he was a doctor "of everything". (TV: Utopia)