ὀκτώμηνος
From LSJ
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
English (LSJ)
ὀκτώμηνον, = ὀκτάμηνος, EM767.34:—also ὀκτωμηνιαῖος, α, ον, Ph.1.29, Sch.Arat.455; born in the eighth month, βρέφη Alex.Aphr. Pr.2.47.
Greek (Liddell-Scott)
ὀκτώμηνος: -ον, = ὀκτάμηνος, Ἐτυμολ. Μέγ. 767. 34· ― ὀκτωμηνιαῖος, α, ον, Λοβ. Φρύν. 549.
