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From: Webster's Revised Unabridged Dictionary (1913)

 Pre·sphe·noid a. Anat. Situated in front of the sphenoid bone; of or pertaining to the anterior part of the sphenoid bone (i. e., the presphenoid bone).
 Presphenoid bone Anat., the anterior part of the body of the sphenoid bone in front of the basisphenoid. It is usually a separate bone in the young or fetus, but becomes a part of the sphenoid in the adult.