Residency or postgraduate training is a stage of graduate medical education. It refers to a qualified physician (one who holds the degree of MD, DO, MBBS/MBChB), veterinarian (DVM/VMD, BVSc/BVMS), dentist (DDS or DMD), podiatrist (DPM), optometrist (OD),pharmacist (PharmD), or Medical Laboratory Scientist (Doctor of Medical Laboratory Science) who practices medicine or surgery, veterinary medicine, dentistry, optometry, podiatry, clinical pharmacy, or Clinical Laboratory Science, respectively, usually in a hospital or clinic, under the direct or indirect supervision of a senior medical clinician registered in that specialty such as an attending physician or consultant.
The term residency is named as such due to resident physicians (resident doctors) of the 19th century residing at the dormitories of the hospital in which they received training.