Which term refers to the skin in medical vocabulary?

The term that refers to the skin in medical vocabulary is "Derm." This term is derived from the Greek word "derma," which means skin. In medical terminology, "derm" is often used as a prefix or root in various terms related to skin conditions, treatments, and anatomy. For example, dermatology is the branch of medicine that focuses on the diagnosis and treatment of skin disorders.

The other terms provided do not relate to the skin. "Gastro" pertains to the stomach, "Episi" refers to the external genitalia, and "Gloss" relates to the tongue. Understanding these definitions helps clarify why "Derm" is the appropriate answer when discussing the skin in a medical context.