δελφύς
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)
ύος, ἡ,
A womb, Hp.Steril.222, Arist.HA510b13, Ath.9.375a:—Dor. δελφύα, ἡ, acc. to Greg.Cor.p.344S.
German (Pape)
[Seite 544] ύος, ἡ, die Gebärmutter, Hippocr. u. Folgende.