Internist (noun)

1. A medical doctor who specializes in the diagnosis and treatment of adult diseases.
2. A physician who deals with the diagnosis and non-surgical treatment of diseases and disorders of internal organs.

Origin:

From the latin word internus (internal) + -ist (one who practices).

Examples:

1. She went to see an internist because she was experiencing chest pain.
2. After the surgery, he had to consult with an internist for the management of his post-operative care.
3. The internist ordered a series of tests to help with the diagnosis.
4. He was referred to an internist to evaluate his ongoing gastrointestinal problems.
5. She was pleased with her internist's comprehensive approach to her health concerns.