I. | ̷ ̷ ̷ ̷ at basi- + adjective
also ba·si·sphenoidal “+
Etymology: International Scientific Vocabulary basi- + sphenoid, sphenoidal
: relating to or being the part of the base of the cranium that lies between the basioccipital and the presphenoid and that usually ossifies separately and becomes a part of the sphenoid only in the adult
II. noun
: the basisphenoid bone