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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.
The medical specialty concerned with the eye, its diseases, and refractive errors. [ophthalmo- + G. logos, study]. /ophÂ·thalÂ·molÂ·oÂ·gy/ (ofâ³thal-molÂ´ah-je) the branch of medicine dealing with the eye, including its anatomy, physiology, and pathology.ophthalmologÂ´ic.