porion: Meaning and Definition of

po•ri•on

Pronunciation: (pôr'ē-on", pōr'-), [key]
— pl. po•ri•a po•ri•ons.
  1. the most lateral point in the roof of the bony external auditory meatus.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.