The Collaborative International Dictionary of English v.0.48:
Stephanion \Ste*pha"ni*on\, n. [NL., from Gr. ? a crown.] (Anat.) The point on the side of the skull where the temporal line, or upper edge of the temporal fossa, crosses the coronal suture. [1913 Webster]WordNet (r) 3.0 (2006):
stephanion n 1: the craniometric point on the coronal suture above the acoustic meatus