The spelling of the word "nasioiniac" can seem confusing at first glance. However, it can be easily explained using IPA phonetic transcription. The word is pronounced as /neɪzi.oʊˈni.æk/. It consists of the prefix "nasio-" meaning nose, and the suffix "-niac" meaning a person who is obsessed or passionate about something. Thus, "nasioiniac" is a term used to describe someone who is obsessed with their nose, whether it be their appearance or their sense of smell.
Relating to the nasion and the inion; noting the distance in a straight line between the frontonasal suture and the external occipital protuberance.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.