The spelling of the word 'sphenion' is often challenging for spellers due to its unusual combination of letters. The IPA transcription of the word is /ˈsfɛniən/. The initial letter of the word is an 's' which is pronounced as /s/. The following letters 'ph' together represent the 'f' sound, and the 'e' is pronounced as /ɛ/. The consistent pattern of '-ion' at the end of the word represents the 'shun' sound, therefore the final syllable is pronounced as /ən/.
The tip of the sphenoidal angle of the parietal bone, a craniometric point.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.