Source : Webster's Revised Unabridged Dictionary (1913)

Basioccipital \Ba`si*oc*cip"i*tal\, a. [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. -- n. The basioccipital bone.