general practitioner

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A physician whose practice is not oriented to a specific medical specialty but instead covers a variety of medical problems in patients of all ages.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A physician who provides primary care; treating acute and chronic illnesses and providing preventive care and health education; a family doctor.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a physician who is not a specialist but treats all illnesses