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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Sphe·noid a.
 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.

From: WordNet (r) 2.0

 sphenoid bone
      n : butterfly-shaped bone at the base of the skull [syn: sphenoid,
           os sphenoidale]