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Related to basisphenoidal: clivus


a.1.(Anat.) Of or pertaining to that part of the base of the cranium between the basioccipital and the presphenoid, which usually ossifies separately in the embryo or in the young, and becomes a part of the sphenoid in the adult.
n.1.(Anat.) The basisphenoid bone.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.