Which of the following refers to a pathological condition in medical terminology?

The suffix that specifically refers to a pathological condition in medical terminology is "-pathy." This suffix is derived from the Greek word "pathos," which means suffering or disease. In medical language, it is used to denote disorders or diseases affecting a particular organ or system. For instance, "neuropathy" refers to a disease affecting the nerves, and "cardiomyopathy" refers to a disease of the heart muscle.

Understanding this suffix is crucial for interpreting medical diagnoses and conditions, as it directly indicates a pathological state. The other options, while they may be related to medical terminology, do not exclusively denote pathological conditions. For example, "-ology" refers to a field of study, "-graft" usually pertains to the process of transplanting tissues, and "-plegia" indicates paralysis rather than a general pathological condition. Thus, "-pathy" is the most appropriate choice in the context of referring to a disease or disorder.