SPHENOID

Etymology

Adjective

sphenoid (not comparable)

Having a wedged shape.

(anatomy) Relating to the compound bone which forms the base of the cranium, behind the eye and below the front part of the brain. It has two pairs of broad lateral ‘wings’ and a number of other projections, and contains two air-filled sinuses.

Noun

sphenoid (plural sphenoids)

(anatomy) The sphenoid bone.

(crystallography) A wedge-shaped crystal bounded by four equal isosceles triangles; the hemihedral form of a square pyramid.

Anagrams

• diphones, siphoned

Source: Wiktionary

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Sphe"noid, a. Etym: [Gr. sphénoïde.]

1. Wedge-shaped; as, a sphenoid crystal.

2. (Anat.)

Definition: 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.)

Definition: A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.

2. (Anat.)

Definition: The sphenoid bone.

Source: Webster’s Unabridged Dictionary 1913 Edition

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