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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.
Medical sign. A medical sign is an objective indication of some medical fact or characteristic that may be detected by a patient or anyone, especially a physician, before or during a physical examination of a patient.