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Definition of D.O
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
D.O.: Abbreviation for Doctor of Osteopathy, an osteopathic physician.
Osteopathy is a system of therapy founded in the 19th century based on the concept that the body can formulate its own remedies against diseases when the body is in a normal structural relationship, has a normal environment and enjoys good nutrition.