[{"Bold_text": "noun", "List Items": ["Pathology.a narrowing of the lumen of a blood vessel.a congenital anomaly of the heart in which there is a narrowing of the aorta, resulting in abnormal blood flow.", "a narrowing of the lumen of a blood vessel.", "a congenital anomaly of the heart in which there is a narrowing of the aorta, resulting in abnormal blood flow.", "Entomology.the condition of having the body enclosed in a hardened shell or puparium."]}]