Which prefix indicates an 'abnormally high' condition?

The prefix "hyper-" signifies an 'abnormally high' condition in medical terminology. This prefix is derived from Greek, where "hyper" means "over" or "excessive." It is commonly used in various medical terms to describe conditions that involve an increase in quantity, function, or activity. For instance, "hypertension" refers to abnormally high blood pressure. Knowing this can help in understanding various medical conditions and their implications in patient care.

In contrast, the other prefixes have different meanings; "hetero-" refers to something that is different or other, "eu-" denotes a normal or good state, and "mal-" signifies a poor or bad condition. Hence, they do not convey the concept of an 'abnormally high' condition like "hyper-" does.