κοροκόσμιον
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)
τό,
A girl's toy or ornament, of masks placed at crossroads, AB102, cf. Sch.Theoc.2.110. II pupil of the eye, PLond. 1821.27.
Greek (Liddell-Scott)
κοροκόσμιον: τό, κορασίου παιγνίδιον ἢ κόσμημα, Κλήμ. Ἀλ. 51, Α. Β. 102.
