What suffix indicates an abnormal condition?

The suffix that indicates an abnormal condition is "-osis." This suffix is commonly used in medical terminology to refer to a condition that is usually pathological or abnormal in nature. For example, "neurosis" indicates a mental health condition characterized by anxiety and other symptoms, while "fibrosis" refers to an abnormal thickening and scarring of connective tissue.

The other suffixes listed have different meanings: "-algia" refers specifically to pain in a specified area, as seen in "myalgia," which means muscle pain. "-dynia" also denotes pain but is typically used in a more specific context, such as in "gastrodynia," which refers to stomach pain. "-megaly" indicates enlargement of an organ, such as in "hepatomegaly," which means enlargement of the liver. Each of these suffixes conveys a specific type of condition but does not universally indicate an abnormal state like "-osis" does.