Which suffix indicates a protective mechanism in medical terminology?

The suffix that indicates a protective mechanism in medical terminology is -phylaxis. This term is derived from the Greek word "phylaktikos," which means "guarding" or "protecting." It is commonly used in medical contexts to refer to processes or treatments that enhance the body's defense mechanisms or prevent disease. For example, in the term "prophylaxis," it signifies a preventive measure against disease.

This suffix is significant in various medical terms related to immunology and preventive medicine, such as in "anaphylaxis," which refers to a severe allergic reaction that can be a protective response to an allergen, albeit an extreme one.

In contrast, the other suffixes pertain to different medical concepts. -plasia refers to formation or growth, particularly of tissues or cells. -phoresis refers to the movement or transfer of substances, often in the context of therapies. -plastic relates to molding or shaping, usually in reference to surgical procedures or repairs of tissues. Understanding the distinction between these terms helps clarify how suffixes are utilized in medical terminology to convey precise meanings.