👉 The word "naphthenic" is a medical term that refers to a substance that can be found in the digestive system. It's also known as "phospholipase A2," which is a enzyme that plays a role in phospholipid metabolism, particularly in the breakdown of phospholipids into their respective fatty acids and glycerol. Naphthenic substances are often used in diagnostic tests and treatment for conditions such as heart disease and cancer.