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Entry 4 senses · 2 variants Webster, 1913

Sphenoid

· Sphe·noid · IPA /ˈsfiː.nɔɪd/
01 a. Wedge-shaped; as, a sphenoid crystal.
  1. 1.
    Wedge-shaped; as, a sphenoid crystal.
  2. 2.
    Of or pertaining to the sphenoid bone.(Anat.)
Phrases & compounds
Sphenoid bone — 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.
02 n. A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.
  1. 1.
    A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.(Crystallog.)
  2. 2.
    The sphenoid bone.(Anat.)