ὀμφαλιστήρ
From LSJ
ταῦτα δὲ ἔδει ποιῆσαι κἀκεῖνα μὴ ἀφιέναι → these things should have been done without neglecting the others | these are the things you should have done without neglecting the others | these ought ye to have done, and not to leave the other undone
English (LSJ)
ῆρος, ὁ,
A knife to cut the navel-string, Poll.2.169,4.208, Hsch.