fortress, fort - a fortified defensive structure. merlon - a solid section between two crenels in a crenelated battlement. bulwark, rampart, wall - an embankment built around a space for defensive purposes; they stormed the ramparts of the city; they blew the trumpet and the walls came tumbling down.
Definition of OCCIPITAL BONE. : a compound bone that forms the posterior part of the skull and bears a condyle by which the skull articulates with the atlas.See occipital bone defined for kids.ADVERTISEMENT. a compound bone that forms the posterior part of the skull and bears a condyle by which the skull articulates with the atlas. See occipital bone defined for kids.
The occipital bone is part of the endocranium, the most basal portion of the skull. In Chondrichthyes and Agnathans, the occipital do not form as a separate element, but remain part of the chondrocranium throughout life. In most higher vertebrates, the foramen magnum is surrounded by a ring of four bones.