Main Entry: ¹sphe·noid

Pronunciation: \ˈsfē-ˌnȯid\

Variant(s): or sphe·noi·dal \sfi-ˈnȯi-d^əl\

Function: adjective

Etymology: New Latin sphenoides, from Greek sphēnoeidēs wedge-shaped, from sphēn wedge

Date: 1732

1 : of, relating to, or being a winged compound bone of the base of the cranium
2 usually sphenoidal : having a wedged shape