Which suffix refers to a condition or disease?

The suffix that refers to a condition or disease is -pathy. It derives from the Greek word "pathos," which means suffering or disease. In medical terminology, it is often used to denote particular diseases, disorders, or conditions affecting a certain part of the body or a specific system.

For example, in the term "neuropathy," the suffix -pathy indicates a disease or disorder of the nerves. Similarly, "cardiomyopathy" refers specifically to a disease of the heart muscle. This suffix is widely recognized in various medical contexts for describing pathological conditions, making it the appropriate choice for this question.

In contrast, the other suffixes serve different purposes: -ous typically describes a quality or relating to a certain condition, -cyte refers to a cell, and -genic relates to the origin or production of something, but none specifically indicate a disease or condition like -pathy does.