• (n.) The basioccipital bone. • (a.) Of or pertaining to the bone in the base of the cranium, frequently forming a part of the occipital in the adult, but usually distinct in the young.
bone that forms the ventral margin of the foramen magnum.
Ba`si·oc·cip'i·tal adjective [ Basi- + occipital .] (Anat.) Of or pertaining to the bone in the base of the cranium, frequently forming a part of the occipital in the adult, but usually distinct in the young. -- noun The basioccipital bone. 
Type: Term Pronunciation: bā′sē-ok-sip′i-tăl Definitions: 1. Relating to the basilar process of the occipital bone.