Which word root refers to cartilage?

The word root that refers to cartilage is "chondro." This term is derived from the Greek word "chondros," meaning cartilage. In medical terminology, "chondro" is often used in various contexts related to cartilage, such as in the terms "chondritis" (inflammation of cartilage) or "chondrocyte" (a cell that produces cartilage). Understanding this root word can be particularly useful in comprehending conditions and treatments associated with cartilage in the body.

The other terms relate to different anatomical structures: "derm" pertains to the skin, "colp" refers to the vagina, and "episi" is associated with the pubic region. Each of these roots has its specific applications in medical terminology, but none of them indicates cartilage, making "chondro" the accurate choice for the definition provided in the question.