Definitions for: Sphenoid

[n] butterfly-shaped bone at the base of the skull

Webster (1913) Definition: Sphe"noid, a. [Gr. ???; sfh`n a wedge + e'i^dos form:
cf. F. sph['e]no["i]de.]
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.

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.

Synonyms: os sphenoidale, sphenoid bone

See Also: bone, crotaphion, os, pterygoid process, skull

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