ἰπωτρίς
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)
ίδος, ἡ, A for pressing in dislocated joints, σπάθη Heliod. ap. Orib.49.32.4 and 17.9.
Greek Monolingual
ἰπωτρίς, ἡ (Α) ιπώ
μέσο πίεσης στις εξαρθρωμένες κλειδώσεις του σώματος.