What medical term refers to a groove or split?

The term that refers to a groove or split is "fissure." In medical terminology, a fissure often describes a natural cleft or division in an organ or structure, such as a crack-like sore in the skin or mucous membrane. This term is commonly used in various medical contexts, such as dermatology (for skin fissures) or in discussions about anatomical features (like those in the brain or digestive tract).

The other terms provided relate to different concepts: "fistula" describes an abnormal connection between two body parts; "artery" refers to blood vessels that carry oxygenated blood from the heart; and "lith" generally pertains to stones or calculus in the body, such as gallstones or kidney stones. Understanding these distinctions helps clarify the specific meaning of "fissure" as a groove or split within a medical framework.