porion

por·i·on

, pl.

po·ri·a

(pōr'ē-on, -ē-ă),
The central point on the upper margin of the external auditory meatus; as a cephalometric landmark, it is located in the middle of the metal rods of the cephalometer.
[G. poros, a passage]

porion

[por′ē·on]
Etymology: Gk. poros, passage
the most lateral point on the roof of the bony external acoustic meatus, vertically over the middle of the meatus. Also called point Po.

por·i·on

, pl. poria (pōr'ē-on, -ă)
Central point on upper margin of external auditory meatus.
[G. poros, a passage]

porion (pō´rēon),

n the superior surface of the external auditory meatus. In craniometry, porion is identified as the margin of the bony canal on the skull. In cephalometrics it may be identified from the earpost of the cephalostat (machine porion) or from bony landmarks on the film (anatomic porion).
References in periodicals archive ?
In its statement, the city notes that Trinity East only submitted three applications for zoning permits, which applied to only a porion of the land it leased.
Porion, introduction to Hadewijch: Lettres spirituelles, Beatrice de Nazareth: Sept degres d'amour, ed.
Intermediate-range efficacy Zonsamide (Zonegran) and levetiracetam Keppra) appear to offer the same range of efficacy as barbiturates, covering some partial seizures and a porion of generalized seizures.