presphenoid, a.
Situated in front of the sphenoid bone; of or pertaining to the anterior part of the sphenoid bone (i. e., the presphenoid bone). [1913 Webster]
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.