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Definition of op. 1  1 chiefly US : a set of planned actions for a particular purpose âusually plural military ops [=operations] 2  2 : op art. 3  3 British, informal : a medical operation â see also photo op.
What does the medical abbreviation OPD mean? In the context of a hospital, OPD stands for Outpatient Department. In New York, and perhaps in other states, it's the Office of Professional Disciplines, the umbrella organ â¦ ization for the Board of Nursing, Board of Medicine, Board of Pharmacy, etc. Out patient department Out patient department Out patient department Out patient department