The Collaborative International Dictionary
Presphenoid
Presphenoid \Pre*sphe"noid\, n. (Anat.) The presphenoid bone.
Presphenoid
Presphenoid \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.
Wiktionary
presphenoid
a. (context anatomy English) Situated in front of the sphenoid bone n. (context anatomy English) The anterior part of the sphenoid bone (a separate bone before being fused)