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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.
DO after a physician's name stands for Doctor of Osteopathic Medicine. DO stands for Doctor of Osteopathic medicine, which is an alternate degree to MD in the United States. DOs can evaluate patients, prescribe medications, and perform surgery. They can specialize in any medical or surgical specialty.