ὀπισθοκράνιον
From LSJ
ἰσότης φιλότητα ἀπεργάζεται → equality leads to friendship
English (LSJ)
[ᾱ], τό,
A the back part of the skull, occiput, Sever. ap. Aët.7.92, Paul.Aeg.6.2, Gloss.
German (Pape)
[Seite 358] τό, der hintere Theil des Hirnschädels, VLL.