Physician (noun)

1. A medical doctor who is qualified to practice medicine and care for patients.
2. A person who is licensed to practice medicine and provide medical care.
3. A person who is trained and licensed to diagnose, treat and prevent illness.

Origin:

From old french physician, from latin physicus ("physician"), from greek φύσις (physis, "nature") + -icus, from φύσις (physis, "nature") + -ικός (-ikos, "-i.c")

Examples:

1. The physician prescribed medication for the patient's illness.
2. She is a physician who specializes in pediatrics.
3. He is a physician who is trained in surgery.