Sphe"noid (?), a. [Gr. ; a wedge + form: cf. F. sph'enoide.]
1.
Wedge-shaped; as, a sphenoid crystal.
2. Anat.
Of or pertaining to the sphenoid bone.
Sphenoid bone Anat., an irregularly shaped bone in front of the occipital in the base of the skull of the higher vertebrates. It is composed of several fetal bones which become united the adult. See Alisphenoid, Basisphenoid, Orbitosphenoid, Presphenoid.
© Webster 1913.
Sphe"noid (?), n.
1. Crystallog.
A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.
2. Anat.
The sphenoid bone.
© Webster 1913.