[sphe.noid] or sphe.noi.dal adj [NL sphenoides, fr. Gk sphenoeides wedge-shaped, fr. sphen wedge] (1732) 1: of, relating to, or being a winged compound bone of the base of the cranium
2. usu sphenoidal: having a wedged shape
[2]sphenoid n (1828): a sphenoid bone