Σφραγίδιον

From LSJ

ὑπὸ δὲ τῆς φιλαυτίας παρηγμένοι ἄλογα φασὶν τὰ ζῷα ἐφεξῆς τὰ ἄλλα σύμπαντα → it is self-love which leads them to say that all the other animals without exception are non-rational

Source

Russian (Dvoretsky)

Σφρᾱγίδιον: τό Сфрагидий (пещера на горе Киферон) Plut.