ὀμφαλιστήρ
From LSJ
ἄμεινον γὰρ ἑαυτῷ φυλάττειν τὴν ἐλευθερίαν τοῦ ἑτέρων ἀφαιρεῖσθαι → for it is better to guard one's own freedom than to deprive another of his
English (LSJ)
ῆρος, ὁ,
A knife to cut the navel-string, Poll.2.169,4.208, Hsch.
German (Pape)
[Seite 343] ῆρος, ὁ, das Messer zum Abschneiden der Nabelschnur, VLL.