A Doctor Who operates on people is called a surgeon.
An atmospheric condenser operates naturally at atmospheric pressure (1.013bar). A vacuum condenser operates at pressures below atmospheric and will use some sort of pump to provide a vacuum.
At the moment, The Doctor has regenerated 10 times, and Matt Smith is the 11th Doctor
Microwave oven
Doctor of Medicine (MD or DM) in Latin called Medicinae Doctor
The episode is called Logopolis and is also the first appearance of Peter Davison (the fifth Doctor).
doctor
doctor
nephrologist
Urologist
Dr. Valentini
a gastroenterologist (?) or a general surgeon or a proctologist
Now there are electronic devices that even do surgery while a doctor operates from the other end.
To have a say in how the government operates.
A surgeon is a physician who operates on people
what kind of doctor operates on the mouth and teeth what kind of doctor straightens teeth what kind of doctor performs root canal therapy
A Witch Doctor.
Usually individual people.