adjective
also sphe·no·basilic |sfē(ˌ)nō+
Etymology: sphenobasilar, from New Latin sphenobasilaris, from sphen- + basilaris basilar, irregular from Latin basis base + -aris -ar; sphenobasilic, probably from New Latin sphenobasil aris + English -ic — more at base
: of, relating to, lying between, or distributed to the sphenoid and the basilar part of the occipital bone