[{"Bold_text": "noun", "List Items": ["a boss on a shield, as one at the center of a circular shield.", "any similar boss or protuberance.", "Zoology.the beak of a bivalve shell; the protuberance of each valve above the hinge.", "Anatomy.the depressed area on the outer surface of the tympanic membrane.", "a blunt or rounded protuberance arising from a surface, as on a pine cone scale."]}]