Definition: Arterious is a medical term meaning an area in the body that has narrowed or narrowed, often causing pain, swelling, or discomfort. The exact definition varies depending on who speaks, but it typically refers to a narrowing or depression in a blood vessel due to scar tissue. In medical terms, arterious can also refer to an obstruction of blood flow within a coronary artery, which could be caused by disease such as angina or heart attack.