tylion

tyl·i·on

, pl.

tyl·i·a

(til'ē-on, -lē-ă; tī'lē-on),
A craniometric point at the middle of the anterior edge of the prechiasmatic sulcus.
[G. a small pin, dim. of tylē, a lump]
Farlex Partner Medical Dictionary © Farlex 2012

tylion

(tĭl′ē-ŏn) [Gr. tyleion, knot]
The point at the middle of the anterior edge of the optic groove.
Medical Dictionary, © 2009 Farlex and Partners