\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.

\Pre*sphe"noid\, n. (Anat.)
The presphenoid bone.