house physician

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A physician, especially an intern or resident who cares for hospitalized patients under the supervision of the surgical and medical staff of a hospital.
2. n. A physician employed by a hotel or another establishment.

GNU Webster's 1913

1. n. the resident medical adviser of a hospital or other public institution.

WordNet 3.0

1. n. a physician (especially an intern) who lives in a hospital and cares for hospitalized patients under the supervision of the medical staff of the hospital